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Error: Object doesn't support this property or method

P: n/a
I'm trying to create the form which would allow data entry
to the Client table, as well as modification and deletion
of existing data rows. For some reason the DataGrid part
of functionality stops working when I include data entry
fields to the form: I click on Delete or Edit inside of
DataGrid and get this error: "Error: Object doesn't
support this property or method"

If I remove data entry fields from the form - DataGrid
allows to delete or update data inside of itself. I don't
see how the data entry fields can cause DataGrid stop
working. I'm going to include my code here.

If you have an example of what I'm trying to do here,
please let me know where I can find it. (I'm just trying
to create a form to view, insert, update, and delete data
from the table.)

Thank you.

<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
<%@ page debug="true" trace="true" %>
<HTML>
<script language="C#" runat="server">

SqlConnection myConnection;

protected void Page_Load(Object Src, EventArgs E)
{
myConnection = new SqlConnection("user
id=sa;password=barrom;initial catalog=propmgmt;data
source=COMP1;Connect Timeout=30");

if (!IsPostBack)
BindGrid();
}

public void MyDataGrid_Edit(Object sender,
DataGridCommandEventArgs E)
{
MyDataGrid.EditItemIndex = (int)E.Item.ItemIndex;
BindGrid();
}

public void MyDataGrid_Cancel(Object sender,
DataGridCommandEventArgs E)
{
MyDataGrid.EditItemIndex = -1;
BindGrid();
}

public void MyDataGrid_Delete(Object sender,
DataGridCommandEventArgs e)
{
String deleteCmd = "DELETE from client where
client_id = @Client_Id";

SqlCommand myCommand = new SqlCommand(deleteCmd,
myConnection);
myCommand.Parameters.Add(new SqlParameter
("@Client_Id", SqlDbType.NVarChar, 10));
myCommand.Parameters["@Client_Id"].Value =
MyDataGrid.DataKeys[(int)e.Item.ItemIndex];

myCommand.Connection.Open();

try
{
myCommand.ExecuteNonQuery();
Message.InnerHtml = "<b>Record
Deleted</b><br>" + deleteCmd;
}
catch (SqlException)
{
Message.InnerHtml = "ERROR: Could not delete
record";
Message.Style["color"] = "red";
}

myCommand.Connection.Close();

BindGrid();
}

public void MyDataGrid_Update(Object sender,
DataGridCommandEventArgs E)
{
String updateCmd = "UPDATE client SET client_id =
@Client_Id, adr_id = @Adr_Id, locale_id = @Locale_id,
status = @Status, "
+ "start_date = @Start_date, expir_date =
@Expir_date, currency = @Currency where client_id =
@Client_Id";

SqlCommand myCommand = new SqlCommand(updateCmd,
myConnection);

myCommand.Parameters.Add(new SqlParameter
("@Client_Id", SqlDbType.NVarChar, 10));
myCommand.Parameters.Add(new SqlParameter
("@Adr_Id", SqlDbType.NVarChar, 20));
myCommand.Parameters.Add(new SqlParameter
("@Locale_id", SqlDbType.NVarChar, 20));
myCommand.Parameters.Add(new SqlParameter
("@Status", SqlDbType.NChar, 1));
myCommand.Parameters.Add(new SqlParameter
("@Start_date", SqlDbType.NVarChar, 19));
myCommand.Parameters.Add(new SqlParameter
("@Expir_date", SqlDbType.NVarChar, 19));
myCommand.Parameters.Add(new SqlParameter
("@Currency", SqlDbType.NVarChar, 10));

myCommand.Parameters["@Client_Id"].Value =
MyDataGrid.DataKeys[E.Item.ItemIndex];

String[] cols =
{"@Client_Id","@Adr_Id","@Locale_id","@Status","@S tart_date
","@Expir_date","@Currency"};

int numCols = E.Item.Cells.Count;
for (int i=2; i<numCols-1; i++) //skip first,
second and last column
{
String colvalue =((TextBox)E.Item.Cells
[i+1].Controls[0]).Text;

// check for null values in required fields
//if (i<7 && colvalue == "")
//{
// Message.InnerHtml = "ERROR: Null values
not allowed for Client ID, Name or Status";
// Message.Style["color"] = "red";
// return;
//}
myCommand.Parameters[cols[i-1]].Value =
Server.HtmlEncode(colvalue);
}

myCommand.Connection.Open();

try
{
myCommand.ExecuteNonQuery();
Message.InnerHtml = "<b>Record
Updated</b><br>" + updateCmd;
MyDataGrid.EditItemIndex = -1;
}
catch (SqlException e)
{
if (e.Number == 2627)
Message.InnerHtml = "ERROR: A record
already exists with the same primary key";
else
Message.InnerHtml = "ERROR: Could not
update record, please ensure the fields are correctly
filled out";
Message.Style["color"] = "red";
}

myCommand.Connection.Close();

BindGrid();
}

private void MyDataGrid_ItemDataBound(object sender,
System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if (e.Item.ItemType == ListItemType.EditItem)
{
for (int i = 0; i < e.Item.Controls.Count; i++)
{
try
{
if (e.Item.Controls[i].Controls
[0].GetType().ToString()
== "System.Web.UI.WebControls.TextBox")
{
TextBox tb = (TextBox)
e.Item.Controls[i].Controls[0];
tb.Text = Server.HtmlDecode
(tb.Text);
}
}
catch
{

}
}
}
}

public void AddClient_Click(Object sender, EventArgs
E)
{
if (client_id.Value == "" || adr_id.Value == "" ||
locale_id.Value == "")
{
Message.InnerHtml = "ERROR: Null values not
allowed for Client ID, Address ID, or Locale ID";
Message.Style["color"] = "red";
BindGrid();
return;
}

String insertCmd = "insert into client " +
" (client_id, adr_id, locale_id, status,
start_date, expir_date, currency) values " +
"(@client_id,@adr_id,@locale_id,@status,@start_dat e
,@expir_date,@currency)";

SqlCommand myCommand = new SqlCommand(insertCmd,
myConnection);

myCommand.Parameters.Add(new SqlParameter
("@client_id", SqlDbType.NVarChar, 20));
myCommand.Parameters["@client_id"].Value =
Server.HtmlEncode(client_id.Value);

myCommand.Parameters.Add(new SqlParameter
("@adr_id", SqlDbType.NVarChar, 20));
myCommand.Parameters["@adr_id"].Value =
Server.HtmlEncode(adr_id.Value);

myCommand.Parameters.Add(new SqlParameter
("@locale_id", SqlDbType.NVarChar, 20));
myCommand.Parameters["@locale_id"].Value =
Server.HtmlEncode(locale_id.Value);

myCommand.Parameters.Add(new SqlParameter
("@status", SqlDbType.NChar, 1));
myCommand.Parameters["@status"].Value =
Server.HtmlEncode(status.Value);

myCommand.Parameters.Add(new SqlParameter
("@start_date", SqlDbType.NVarChar, 19));
myCommand.Parameters["@start_date"].Value =
Server.HtmlEncode(start_date.Value);

myCommand.Parameters.Add(new SqlParameter
("@expir_date", SqlDbType.NVarChar, 19));
myCommand.Parameters["@expir_date"].Value =
Server.HtmlEncode(expir_date.Value);

myCommand.Parameters.Add(new SqlParameter
("@currency", SqlDbType.NVarChar, 10));
myCommand.Parameters["@currency"].Value =
Server.HtmlEncode(currency.Value);

myCommand.Connection.Open();

try
{
myCommand.ExecuteNonQuery();
Message.InnerHtml = "<b>Record Added</b><br>"
+ insertCmd.ToString();
}
catch (SqlException e)
{
if (e.Number == 2627)
Message.InnerHtml = "ERROR: A record
already exists with the same primary key";
else
Message.InnerHtml = "ERROR: Could not add
record, please ensure the fields are correctly filled out";
Message.Style["color"] = "red";
}

myCommand.Connection.Close();

BindGrid();
}

public void BindGrid()
{
SqlDataAdapter myCommand = new SqlDataAdapter
("select * from client", myConnection);

DataSet ds = new DataSet();
myCommand.Fill(ds, "client");

MyDataGrid.DataSource=ds.Tables
["client"].DefaultView;
MyDataGrid.DataBind();
}
</script>
<body style="FONT: 10pt verdana"
background="bg_blond.jpg">
<form runat="server">
<table width="95%">
<tr>

<td nowrap>Client ID</td>

<td width="163"><input type="text" id="client_id"
runat="server" NAME="client_id"></td>

<td nowrap>Address ID</td>

<td width="163"><input type="text" id="adr_id"
runat="server" NAME="adr_id"></td>

</tr>

<tr>

<td nowrap>Locale ID</td>

<td width="163"><input type="text" id="locale_id"
runat="server" NAME="locale_id"></td>

</tr>

<tr>

<td><hr size="3">

</td>

<td><hr size="3">

</td>

<td><hr size="3">

</td>

<td><hr size="3">

</td>

</tr>

<tr>

<td nowrap>Status</td>

<td width="163"><input type="text" id="status"
runat="server" NAME="status"></td>

<td nowrap>Start Date</td>

<td><input type="text" id="start_date"
runat="server" NAME="start_date">

<asp:CompareValidator Runat="server"
ID="startDateCompareValidator"
ControlToValidate="start_date" Display="Dynamic"

Operator="DataTypeCheck"
Type="Date" ErrorMessage="Must enter a valid date." />

<asp:RangeValidator Runat="server"
ID="startDateRangeValidator"
ControlToValidate="start_date" Display="Dynamic"

MinimumValue="2004-1-1"
MaximumValue="9999-12-31" Type="Date" ErrorMessage="Date
entered is out of range." />

</td>

</tr>

<tr>

<td nowrap>Currency Code</td>

<td><input type="text" id="currency"
runat="server" NAME="currency"></td>

<td nowrap>Expiration Date</td>

<td width="163"><input type="text" id="expir_date"
runat="server" NAME="expir_date">

<asp:CompareValidator Runat="server"
ID="exprDateCompareValidator"
ControlToValidate="expir_date" Display="Dynamic"

Operator="DataTypeCheck"
Type="Date" ErrorMessage="Must enter a valid date." />

<asp:RangeValidator Runat="server"
ID="exprDateRangeValidator" ControlToValidate="expir_date"
Display="Dynamic"

MinimumValue="2004-1-1"
MaximumValue="9999-12-31" Type="Date" ErrorMessage="Date
entered is out of range." />

</td>

</tr>

<tr>

<td></td>

<td width="163">

<input type="submit"
OnServerClick="AddClient_Click" value="Add Client"
runat="server"

ID="submit" NAME="submit">

</td>

</tr>

<tr>

<td colspan="2" align="center" width="295">

<span id="Message" runat="server"></span>

</td>

</tr>
</table>
<br>

<asp:DataGrid id="MyDataGrid" runat="server"
Width="800" BackColor="#ccccff" BorderColor="black"

ShowFooter="false" CellPadding="3" CellSpacing="1"
Font-Name="Verdana" Font-Size="8pt"
OnItemDataBound="MyDataGrid_ItemDataBound"

OnDeleteCommand="MyDataGrid_Delete"
OnEditCommand="MyDataGrid_Edit"
OnCancelCommand="MyDataGrid_Cancel"

OnUpdateCommand="MyDataGrid_Update"
DataKeyField="client_id" AutoGenerateColumns="False"
EnableViewState="true"

Visible="true">

<EditItemStyle BackColor="#33CCFF"></EditItemStyle>

<AlternatingItemStyle
BackColor="#99CCFF"></AlternatingItemStyle>

<HeaderStyle Font-Bold="True" ForeColor="White"
BackColor="#0066FF"></HeaderStyle>

<Columns>

<asp:ButtonColumn Text="Delete"
CommandName="Delete"></asp:ButtonColumn>

<asp:EditCommandColumn ButtonType="LinkButton"
UpdateText="Update" CancelText="Cancel" EditText="Edit">

<ItemStyle Wrap="False"></ItemStyle>

</asp:EditCommandColumn>

<asp:BoundColumn DataField="client_id"
SortExpression="client_id" ReadOnly="True"
HeaderText="client_id">

<ItemStyle Wrap="False"></ItemStyle>

</asp:BoundColumn>

<asp:BoundColumn DataField="adr_id"
SortExpression="adr_id"
HeaderText="adr_id"></asp:BoundColumn>

<asp:BoundColumn DataField="locale_id"
SortExpression="locale_id"
HeaderText="locale_id"></asp:BoundColumn>

<asp:BoundColumn DataField="status"
SortExpression="status"
HeaderText="status"></asp:BoundColumn>

<asp:BoundColumn DataField="start_date"
SortExpression="start_date"
HeaderText="start_date"></asp:BoundColumn>

<asp:BoundColumn DataField="expir_date"
SortExpression="expir_date"
HeaderText="expir_date"></asp:BoundColumn>

<asp:BoundColumn DataField="currency"
SortExpression="currency"
HeaderText="currency"></asp:BoundColumn>

</Columns>

</asp:DataGrid>
</form>
</body>
</HTML>
Nov 18 '05 #1
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