hi all..
I am trying to update my datagrid in my webform...but its not getting updated..though in the database it removing the <null> and inserting a blank field....its not taking the input which m typing...can sombody plz help me out in this..i need help urgently
I am posting the code in vb.net for the webform as well as html -
Protected Sub DataGrid1_UpdateCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.UpdateCommand
-
Dim Stocksent1 As TextBox = CType(e.Item.FindControl("TextBox2"), TextBox)
-
Dim Signed1 As TextBox = CType(e.Item.FindControl("SignedTextBox"), TextBox)
-
Dim Items1 As String = DataGrid1.DataKeys(e.Item.ItemIndex).ToString()
-
Dim myConnection As New SqlConnection("Server=SERVER;uid=sa;pwd=;Database=Central")
-
myConnection.Open()
-
-
myCommand1 = New SqlCommand("Update Table3 set Stocksent='" & Stocksent1.Text & "', Signedby='" & Signed1.Text & "' , Flag=0, Sentdate=getdate() where Items='" & Items1 & "' ", myConnection)
-
'myCommand1.Parameters.Add("@Items", SqlDbType.NVarChar).Value = Items
-
'myCommand1.Parameters.Add("@Stocksent1", SqlDbType.NVarChar).Value = Stocksent1.Text
-
'myCommand1.Parameters.Add("@Signedby1", SqlDbType.NVarChar).Value = Signed1.Text
-
ra = myCommand1.ExecuteNonQuery()
-
myConnection.Close()
-
Response.Write("Records Updated")
-
DataGrid1.EditItemIndex = -1
-
DataGrid1.DataBind()
-
DataGrid1.Columns(8).Visible = False
-
DataGrid1.Columns(9).Visible = False
-
DataGrid1.Columns(10).Visible = False
-
DataGrid1.Columns(11).Visible = False
-
DataGrid1.Columns(12).Visible = False
-
-
End Sub
-
HTML CODE -
<form id="Form1" method="post" runat="server">
-
<asp:datagrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 64px; POSITION: absolute; TOP: 296px"
-
runat="server" AutoGenerateColumns="False" DataKeyField="Items" Width="848px" ForeColor="DimGray"
-
BackColor="Wheat" BorderColor="#660033" Height="72px">
-
<HeaderStyle Font-Bold="True" ForeColor="Chocolate" BackColor="LightGray"></HeaderStyle>
-
<Columns>
-
<asp:BoundColumn DataField="Lognumm" ReadOnly="True" HeaderText="Lognumm"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Requestdate" ReadOnly="True" HeaderText="Requestdate"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Hospital" ReadOnly="True" HeaderText="Hospital"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Items" ReadOnly="True" HeaderText="Items"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Currentstock" ReadOnly="True" HeaderText="Currentstock"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Stockrequest" ReadOnly="True" HeaderText="Stockrequest"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Priority" ReadOnly="True" HeaderText="Priority"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Comment" ReadOnly="True" HeaderText="Comment"></asp:BoundColumn>
-
<asp:TemplateColumn Visible="False" HeaderText="Stocksent">
-
<ItemTemplate>
-
<asp:Label id=Label2 runat="server" Text='<%# DataBinder.Eval (Container.DataItem , "Stocksent") %>'>
-
</asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id=TextBox2 runat="server" Text='<%# DataBinder.Eval(Container.DataItem , "Stocksent") %>'>
-
</asp:TextBox>
-
<asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ErrorMessage="Enter value" ControlToValidate="TextBox2"></asp:RequiredFieldValidator>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn Visible="False" HeaderText="Signedby">
-
<ItemTemplate>
-
<asp:Label id=Label1 runat="server" NAME="Label1" Text='<%# DataBinder.Eval(Container, "DataItem.Signedby") %>'>
-
</asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id=SignedTextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Signedby") %>'>
-
</asp:TextBox>
-
<asp:RequiredFieldValidator id="RequiredFieldValidator2" runat="server" Width="128px" ErrorMessage="Enter Value"
-
ControlToValidate="SignedTextBox"></asp:RequiredFieldValidator>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
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<asp:TemplateColumn Visible="False" HeaderText="Takenby">
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<ItemTemplate>
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<asp:Label id="Label3" runat="server"></asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
-
<asp:RequiredFieldValidator id="RequiredFieldValidator3" runat="server" ErrorMessage="Enter Value" ControlToValidate="TextBox1"></asp:RequiredFieldValidator>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn Visible="False" HeaderText="Comments">
-
<ItemTemplate>
-
<asp:Label runat="server"></asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox runat="server"></asp:TextBox>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn HeaderText="Edit">
-
<ItemTemplate>
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<asp:LinkButton runat="server" CausesValidation="false" CommandName="Edit" Text="Edit" ID="Linkbutton1"></asp:LinkButton>
-
</ItemTemplate>
-
<EditItemTemplate>
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<asp:LinkButton runat="server" CommandName="Update" Text="Update" ID="Linkbutton2"></asp:LinkButton>
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<asp:LinkButton runat="server" CausesValidation="false" CommandName="Cancel" Text="Cancel" ID="Linkbutton3"></asp:LinkButton>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
</Columns>
-
</asp:datagrid>
Nov 15 '07
23 1946 Frinavale 9,735
Recognized Expert Moderator Expert
hi i did it but its like showing me a blank page wehn i click edit...y is it so???
I think it's because you're not setting the source.
You need to set the DataSource before binding in the edit.
Try storing your DataSource object in Session and resetting your Grid's DataSource to this before DataBind in your Edit function.
Get back to me on whether or not it worked.
(PS you've Almost got the [code] tags working for you! just don't use vb.net...use vbnet instead! hehe)
I think it's because you're not setting the source.
You need to set the DataSource before binding in the edit.
Try storing your DataSource object in Session and resetting your Grid's DataSource to this before DataBind in your Edit function.
Get back to me on whether or not it worked.
(PS you've Almost got the [code] tags working for you! just don't use vb.net...use vbnet instead! hehe)
hiya sorry to bother u
but can u plz write down the code for me as m all new 2 .net i dunno much abt this plzzzz...n yippeee i have finally learnt the code tags....(cheers 2 u)
Frinavale 9,735
Recognized Expert Moderator Expert
hiya sorry to bother u
but can u plz write down the code for me as m all new 2 .net i dunno much abt this plzzzz...n yippeee i have finally learnt the code tags....(cheers 2 u)
Normally we don't write code for you. The experts/moderators/administrators are here to help you understand the problem so that you can solve it.
But I'm going to show you what I mean through code anyway... -
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
-
-
-
If IsPostBack = False Then
-
-
Dim cn As New SqlConnection("Server=SERVER;uid=sa;pwd=;Database=Central")
-
Dim da As New SqlDataAdapter("select * from Table3 where Lognumm= '" & Request.QueryString("ID") & "' and Flag=1", cn)
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Dim dt As New DataTable
-
da.Fill(dt)
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da.Dispose()
-
cn.Dispose()
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Session("dt") = dt 'I am storing the data source in Session so that we can use it again upon postback.
-
Me.DataGrid1.DataSource = dt
-
Me.DataGrid1.DataBind()
-
-
End If
-
End Sub
-
'........................................
-
Protected Sub DataGrid1_EditCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.EditCommand
-
DataGrid1.Columns(8).Visible = True
-
DataGrid1.Columns(9).Visible = True
-
DataGrid1.Columns(10).Visible = True
-
DataGrid1.Columns(11).Visible = True
-
-
DataGrid1.EditItemIndex = e.Item.ItemIndex
-
DataGrid1.DataSource = Ctype( Session("dt"), DataTable) 'Here I'm grabbing the data source from session so that we actually bind Data to the data grid...instead of nothing
-
DataGrid1.DataBind()
-
-
End Sub
For more information on Sessions please see the .NET Article on Sessions
Normally we don't write code for you. The experts/moderators/administrators are here to help you understand the problem so that you can solve it.
But I'm going to show you what I mean through code anyway... -
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
-
-
-
If IsPostBack = False Then
-
-
Dim cn As New SqlConnection("Server=SERVER;uid=sa;pwd=;Database=Central")
-
Dim da As New SqlDataAdapter("select * from Table3 where Lognumm= '" & Request.QueryString("ID") & "' and Flag=1", cn)
-
Dim dt As New DataTable
-
da.Fill(dt)
-
da.Dispose()
-
cn.Dispose()
-
Session("dt") = dt 'I am storing the data source in Session so that we can use it again upon postback.
-
Me.DataGrid1.DataSource = dt
-
Me.DataGrid1.DataBind()
-
-
End If
-
End Sub
-
'........................................
-
Protected Sub DataGrid1_EditCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataGridCommandEventArgs) Handles DataGrid1.EditCommand
-
DataGrid1.Columns(8).Visible = True
-
DataGrid1.Columns(9).Visible = True
-
DataGrid1.Columns(10).Visible = True
-
DataGrid1.Columns(11).Visible = True
-
-
DataGrid1.EditItemIndex = e.Item.ItemIndex
-
DataGrid1.DataSource = Ctype( Session("dt"), DataTable) 'Here I'm grabbing the data source from session so that we actually bind Data to the data grid...instead of nothing
-
DataGrid1.DataBind()
-
-
End Sub
For more information on Sessions please see the .NET Article on Sessions
yes i got it thanx a heap....thanks alot i was rely worried abt this...
can i ask u another qeury on my project plzz
Frinavale 9,735
Recognized Expert Moderator Expert
yes i got it thanx a heap....thanks alot i was rely worried abt this...
can i ask u another qeury on my project plzz
I'm glad to have helped.
Please post a new thread in the .NET Forum about your other question :)
(unless, of course, it's related to this one)
-Frinny
I'm glad to have helped.
Please post a new thread in the .NET Forum about your other question :)
(unless, of course, it's related to this one)
-Frinny
hi yes its related 2 this so m posting it here
well d first 2 field in this r getting updated but then wen i have added 2 more fields in this its not updating...y is it so?
m giving u d code below -
-
Dim Stocksent1 As TextBox = CType(e.Item.FindControl("TextBox2"), TextBox)
-
Dim Signed1 As TextBox = CType(e.Item.FindControl("SignedTextBox"), TextBox)
-
Dim Takenby1 As TextBox = CType(e.Item.FindControl("TextBox1"), TextBox)
-
Dim Comments1 As TextBox = CType(e.Item.FindControl("TextBox4"), TextBox)
-
Dim Items1 As String = DataGrid1.DataKeys(e.Item.ItemIndex).ToString()
-
Dim myConnection As New SqlConnection("Server=SERVER;uid=sa;pwd=;Database=Central")
-
myConnection.Open()
-
myCommand1 = New SqlCommand("Update Table3 set Stocksent='" & Stocksent1.Text & "', Signedby='" & Signed1.Text & "',Takenby='" & Takenby1.Text & "', Comments='" & Comments1.Text & "', Flag=0, Sentdate=getdate() where Items='" & Items1 & "' ", myConnection)
-
ra = myCommand1.ExecuteNonQuery()
-
myConnection.Close()
-
Response.Write("Records Updated")
-
DataGrid1.EditItemIndex = -1
-
DataGrid1.DataBind()
-
DataGrid1.Columns(8).Visible = False
-
DataGrid1.Columns(9).Visible = False
-
DataGrid1.Columns(10).Visible = False
-
DataGrid1.Columns(11).Visible = False
-
DataGrid1.Columns(12).Visible = False
-
-
-
<asp:datagrid id="DataGrid1" style="Z-INDEX: 101; LEFT: 64px; POSITION: absolute; TOP: 296px"
-
runat="server" Height="72px" BorderColor="#660033" BackColor="Wheat" ForeColor="DimGray" Width="848px"
-
DataKeyField="Items" AutoGenerateColumns="False">
-
<HeaderStyle Font-Bold="True" ForeColor="Chocolate" BackColor="LightGray"></HeaderStyle>
-
<Columns>
-
<asp:BoundColumn DataField="Lognumm" ReadOnly="True" HeaderText="Lognumm"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Requestdate" ReadOnly="True" HeaderText="Requestdate"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Hospital" ReadOnly="True" HeaderText="Hospital"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Items" ReadOnly="True" HeaderText="Items"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Currentstock" ReadOnly="True" HeaderText="Currentstock"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Stockrequest" ReadOnly="True" HeaderText="Stockrequest"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Priority" ReadOnly="True" HeaderText="Priority"></asp:BoundColumn>
-
<asp:BoundColumn DataField="Comment" ReadOnly="True" HeaderText="Comment"></asp:BoundColumn>
-
<asp:TemplateColumn HeaderText="Stocksent">
-
<ItemTemplate>
-
<asp:Label id=Label2 runat="server" Text='<%# DataBinder.Eval (Container.DataItem , "Stocksent") %>'>
-
</asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id=TextBox2 runat="server" Text='<%# DataBinder.Eval(Container.DataItem , "Stocksent") %>'>
-
</asp:TextBox>
-
<asp:RequiredFieldValidator id="RequiredFieldValidator1" runat="server" ControlToValidate="TextBox2" ErrorMessage="Enter value"></asp:RequiredFieldValidator>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn HeaderText="Signedby">
-
<ItemTemplate>
-
<asp:Label id=Label1 runat="server" NAME="Label1" Text='<%# DataBinder.Eval(Container, "DataItem.Signedby") %>'>
-
</asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id=SignedTextBox runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Signedby") %>'>
-
</asp:TextBox>
-
<asp:RequiredFieldValidator id="RequiredFieldValidator2" runat="server" Width="128px" ErrorMessage="Enter Value"
-
ControlToValidate="SignedTextBox"></asp:RequiredFieldValidator>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn HeaderText="Takenby">
-
<ItemTemplate>
-
<asp:Label id="Label3" runat="server" Text='<%# DataBinder.Eval (Container, "DataItem.Takenby") %>'>
-
</asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id="TextBox1" runat="server" Text='<%# DataBinder.Eval(Container, "DataItem.Takenby") %>'>
-
</asp:TextBox>
-
<asp:RequiredFieldValidator id="RequiredFieldValidator3" runat="server" ErrorMessage="Enter Value" ControlToValidate="TextBox1"></asp:RequiredFieldValidator>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn HeaderText="Comments">
-
<ItemTemplate>
-
<asp:Label id="Label4" runat="server" Text='<%# DataBinder.Eval (Container, "DataItem.Comments") %>'>
-
</asp:Label>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:TextBox id="TextBox3" runat="server" Text='<%# DataBinder.Eval (Container, "DataItem.Comments") %>'>
-
</asp:TextBox>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
<asp:TemplateColumn HeaderText="Edit">
-
<ItemTemplate>
-
<asp:LinkButton runat="server" CausesValidation="false" CommandName="Edit" Text="Edit" ID="Linkbutton1"></asp:LinkButton>
-
</ItemTemplate>
-
<EditItemTemplate>
-
<asp:LinkButton runat="server" CommandName="Update" Text="Update" ID="Linkbutton2"></asp:LinkButton>
-
<asp:LinkButton runat="server" CausesValidation="false" CommandName="Cancel" Text="Cancel" ID="Linkbutton3"></asp:LinkButton>
-
</EditItemTemplate>
-
</asp:TemplateColumn>
-
</Columns>
-
</asp:datagrid>
-
ERROR:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullRefe renceException: Object reference not set to an instance of an object.
Line 66: myCommand1 = New SqlCommand("Upd ate Table3 set Stocksent='" & Stocksent1.Text & "', Signedby='" & Signed1.Text & "',Takenby= '" & Takenby1.Text & "', Comments='" & Comments1.Text & "', Flag=0, Sentdate=getdat e() where Items='" & Items1 & "' ", myConnection)
Frinavale 9,735
Recognized Expert Moderator Expert
hi yes its related 2 this so m posting it here
well d first 2 field in this r getting updated but then wen i have added 2 more fields in this its not updating...y is it so?
m giving u d code below...
ERROR:
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.NullRefe renceException: Object reference not set to an instance of an object.
Line 66: myCommand1 = New SqlCommand("Upd ate Table3 set Stocksent='" & Stocksent1.Text & "', Signedby='" & Signed1.Text & "',Takenby= '" & Takenby1.Text & "', Comments='" & Comments1.Text & "', Flag=0, Sentdate=getdat e() where Items='" & Items1 & "' ", myConnection)
This type of error means that you are trying to use a variable before it has been initialized. For each object you should be using "new". Since you are grabbing these objects from the DataGrid, I recommend checking to see if any of them are are nothing....
Eg -
If Stocksent1 Is Nothing Then
-
'if you try to use Stocksent1 when it is nothing you will get this error.
-
'Do something here to avoid your exception
-
End If
Also, just a side note here but it's important, you shouldn't be using input directly from the user for creating your database query. This is dangerous and could result in your site being hacked.
Please see the .NET article on how to use a database in your program for an example on how to use these parameters correctly. This may also help you to figure out which variable is actually causing your error as well.
-Frinny
This type of error means that you are trying to use a variable before it has been initialized. For each object you should be using "new". Since you are grabbing these objects from the DataGrid, I recommend checking to see if any of them are are nothing....
Eg -
If Stocksent1 Is Nothing Then
-
'if you try to use Stocksent1 when it is nothing you will get this error.
-
'Do something here to avoid your exception
-
End If
Also, just a side note here but it's important, you shouldn't be using input directly from the user for creating your database query. This is dangerous and could result in your site being hacked.
Please see the .NET article on how to use a database in your program for an example on how to use these parameters correctly. This may also help you to figure out which variable is actually causing your error as well.
-Frinny
alright..but wen i was using the 1st 2 fields it worked wen ma dding these 2 new fields in d same way its not working..though wen i comment them n work d first 2 still work..though all of them have been initialized d same way....
alright..but wen i was using the 1st 2 fields it worked wen ma dding these 2 new fields in d same way its not working..though wen i comment them n work d first 2 still work..though all of them have been initialized d same way....
i got the answer i was just doin a simple mistake by giving a wrong textbox name....thanx 4 ur help anywayz.. posting a new query on crystal reports...help me out if u can in it...tc
Frinavale 9,735
Recognized Expert Moderator Expert
i got the answer i was just doin a simple mistake by giving a wrong textbox name....thanx 4 ur help anywayz.. posting a new query on crystal reports...help me out if u can in it...tc
Good work!
Feel free to ask for help any time :)
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I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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