Deleting items from a Datagrid

Stephen

I've got a datagrid with a remove button and I would like to add some code in
the code behind page so as whenthe button is clicked the corresponding row in
the datagrid is removed. The Datagrid is populated by the items in an
arraylist shown in the code below. When the button is clicked I would also
like the code to remove the items from the Arraylist. I've very little
experience working with datagrids and arraylists so im finding this difficult
to do and would really appreciate it if I could get some help from anyone
with this.

I know how to get the event up but not sure what to add into the event below
to achieve what I need to do: -
private void DataGrid1_Delet eCommand(object source,
System.Web.UI.W ebControls.Data GridCommandEven tArgs e)
{

}

This is how I currently create the arraylist and populate the datagrid: -
private void Page_Load(objec t sender, System.EventArg s e)
{
ArrayList addresses;

// when the page is first loaded only
if( !IsPostBack )
{
addresses = new ArrayList(5);
ViewState["Addresses"] = addresses;
}
// on subsequent PostBacks:
else
{
addresses = (ArrayList) ViewState["Addresses"];
if( addresses != null )
{
DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}
}
}

private void Button1_Click(o bject sender, System.EventArg s e)
{
ArrayList addresses;

addresses = (ArrayList) ViewState["Addresses"];

Address newAddress = new Address();
newAddress.Addr ess1 = this.TextBox1.T ext.Trim();
newAddress.Addr ess2 = this.TextBox2.T ext.Trim();
newAddress.Addr ess3 = this.TextBox3.T ext.Trim();
newAddress.Addr ess4 = this.TextBox4.T ext.Trim();
newAddress.Addr ess5 = this.TextBox5.T ext.Trim();
newAddress.Addr ess6 = this.TextBox6.T ext.Trim();
addresses.Add(n ewAddress);
ViewState["Addresses"] = addresses;

DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}

My datagrid code is as follows: -

<asp:DataGrid id="DataGrid1" style="Z-INDEX: 108; LEFT: 73px; POSITION:
absolute; TOP: 306px" runat="server" Width="459px"
AutoGenerateCol umns="false">
<Columns>
<asp:BoundColum n DataField="Addr ess1" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress1" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess2" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress2" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess3" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress3" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess4" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress4" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess5" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress5" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess6" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress6" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:ButtonColu mn Text="Remove" ItemStyle-HorizontalAlign ="Center"
HeaderText="" CommandName="Re move" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k"
HeaderStyle-ForeColor="Whit e"></asp:ButtonColum n>
</Columns>
</asp:DataGrid>
Thanks for any help anyone can give me

Jul 21 '05 #1

Subscribe Reply

3051

Kannan.V

hi stephen,

you have to delete the item form the arraylist.
arraylist object provides a remove method, u need to pass the item to be
removed, in your case you can pass the string to be deleted.

Ex.
addresses.Remov e("myAddress" );

your next question might be, how do i get the text from the currently
selected row.

the datagrid has a property called the itemindex which returns the currently
selected row index as an integer.

so to get the text from the first cell in the datagrid that is displaying
your data,
u might have to use something similar to the sample shown below.

e.Item.Cells[0].Text

this returns the text in the first cell in the row where the edit button was
clicked.
pass this text to the remove method of the arraylist.
After removing from the arraylist, rebind the datagrid.

Hope this was helpful to you.
Regds,
http://kannanv.blogspot.com
"Stephen" wrote:

I've got a datagrid with a remove button and I would like to add some code in
the code behind page so as whenthe button is clicked the corresponding row in
the datagrid is removed. The Datagrid is populated by the items in an
arraylist shown in the code below. When the button is clicked I would also
like the code to remove the items from the Arraylist. I've very little
experience working with datagrids and arraylists so im finding this difficult
to do and would really appreciate it if I could get some help from anyone
with this.

I know how to get the event up but not sure what to add into the event below
to achieve what I need to do: -
private void DataGrid1_Delet eCommand(object source,
System.Web.UI.W ebControls.Data GridCommandEven tArgs e)
{

}

This is how I currently create the arraylist and populate the datagrid: -
private void Page_Load(objec t sender, System.EventArg s e)
{
ArrayList addresses;

// when the page is first loaded only
if( !IsPostBack )
{
addresses = new ArrayList(5);
ViewState["Addresses"] = addresses;
}
// on subsequent PostBacks:
else
{
addresses = (ArrayList) ViewState["Addresses"];
if( addresses != null )
{
DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}
}
}

private void Button1_Click(o bject sender, System.EventArg s e)
{
ArrayList addresses;

addresses = (ArrayList) ViewState["Addresses"];

Address newAddress = new Address();
newAddress.Addr ess1 = this.TextBox1.T ext.Trim();
newAddress.Addr ess2 = this.TextBox2.T ext.Trim();
newAddress.Addr ess3 = this.TextBox3.T ext.Trim();
newAddress.Addr ess4 = this.TextBox4.T ext.Trim();
newAddress.Addr ess5 = this.TextBox5.T ext.Trim();
newAddress.Addr ess6 = this.TextBox6.T ext.Trim();
addresses.Add(n ewAddress);
ViewState["Addresses"] = addresses;

DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}

My datagrid code is as follows: -

<asp:DataGrid id="DataGrid1" style="Z-INDEX: 108; LEFT: 73px; POSITION:
absolute; TOP: 306px" runat="server" Width="459px"
AutoGenerateCol umns="false">
<Columns>
<asp:BoundColum n DataField="Addr ess1" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress1" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess2" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress2" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess3" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress3" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess4" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress4" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess5" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress5" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess6" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress6" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:ButtonColu mn Text="Remove" ItemStyle-HorizontalAlign ="Center"
HeaderText="" CommandName="Re move" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k"
HeaderStyle-ForeColor="Whit e"></asp:ButtonColum n>
</Columns>
</asp:DataGrid>
Thanks for any help anyone can give me

Jul 21 '05 #2

Stephen

I tried the following and nothing seemed to have happened. Am I along the
correct lines. Thanks for your help so far I definitely understand how to do
it now, im just having difficulty executing it with the code. Do you have
any idea where I am going wrong. At present when the button is clicked
nothing seems to be happening.

private void DataGrid1_Delet eCommand(object source,
System.Web.UI.W ebControls.Data GridCommandEven tArgs e)
{
ArrayList addresses;
addresses = (ArrayList) ViewState["Addresses"];
string myAddress = e.Item.Cells[0].Text;
addresses.Remov e("myAddress" );
DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}

"Kannan.V" wrote:

hi stephen,

you have to delete the item form the arraylist.
arraylist object provides a remove method, u need to pass the item to be
removed, in your case you can pass the string to be deleted.

Ex.
addresses.Remov e("myAddress" );

your next question might be, how do i get the text from the currently
selected row.

the datagrid has a property called the itemindex which returns the currently
selected row index as an integer.

so to get the text from the first cell in the datagrid that is displaying
your data,
u might have to use something similar to the sample shown below.

e.Item.Cells[0].Text

this returns the text in the first cell in the row where the edit button was
clicked.
pass this text to the remove method of the arraylist.
After removing from the arraylist, rebind the datagrid.

Hope this was helpful to you.
Regds,
http://kannanv.blogspot.com
"Stephen" wrote:
I've got a datagrid with a remove button and I would like to add some code in
the code behind page so as whenthe button is clicked the corresponding row in
the datagrid is removed. The Datagrid is populated by the items in an
arraylist shown in the code below. When the button is clicked I would also
like the code to remove the items from the Arraylist. I've very little
experience working with datagrids and arraylists so im finding this difficult
to do and would really appreciate it if I could get some help from anyone
with this.

I know how to get the event up but not sure what to add into the event below
to achieve what I need to do: -
private void DataGrid1_Delet eCommand(object source,
System.Web.UI.W ebControls.Data GridCommandEven tArgs e)
{

}

This is how I currently create the arraylist and populate the datagrid: -
private void Page_Load(objec t sender, System.EventArg s e)
{
ArrayList addresses;

// when the page is first loaded only
if( !IsPostBack )
{
addresses = new ArrayList(5);
ViewState["Addresses"] = addresses;
}
// on subsequent PostBacks:
else
{
addresses = (ArrayList) ViewState["Addresses"];
if( addresses != null )
{
DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}
}
}

private void Button1_Click(o bject sender, System.EventArg s e)
{
ArrayList addresses;

addresses = (ArrayList) ViewState["Addresses"];

Address newAddress = new Address();
newAddress.Addr ess1 = this.TextBox1.T ext.Trim();
newAddress.Addr ess2 = this.TextBox2.T ext.Trim();
newAddress.Addr ess3 = this.TextBox3.T ext.Trim();
newAddress.Addr ess4 = this.TextBox4.T ext.Trim();
newAddress.Addr ess5 = this.TextBox5.T ext.Trim();
newAddress.Addr ess6 = this.TextBox6.T ext.Trim();
addresses.Add(n ewAddress);
ViewState["Addresses"] = addresses;

DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}

My datagrid code is as follows: -

<asp:DataGrid id="DataGrid1" style="Z-INDEX: 108; LEFT: 73px; POSITION:
absolute; TOP: 306px" runat="server" Width="459px"
AutoGenerateCol umns="false">
<Columns>
<asp:BoundColum n DataField="Addr ess1" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress1" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess2" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress2" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess3" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress3" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess4" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress4" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess5" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress5" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess6" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress6" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:ButtonColu mn Text="Remove" ItemStyle-HorizontalAlign ="Center"
HeaderText="" CommandName="Re move" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k"
HeaderStyle-ForeColor="Whit e"></asp:ButtonColum n>
</Columns>
</asp:DataGrid>
Thanks for any help anyone can give me

Jul 21 '05 #3

Kannan.V

hi stephen......

from the code you have shown below,
****
string myAddress = e.Item.Cells[0].Text;
addresses.Remov e("myAddress" );
****

you have assigned the text from the datagrid to a string variable and in the
second line you are trying to remove a static string by enclosing it within
"Quotes"... ....
remove the "" form the myAddress.
myAddress is a variable of string type and it will replace the value inside
the remove method with the string returned from the previous line and the
item that matches that string will be remove from the arraylist....

Hope it worked....
Regds
http://kannanv.blogspot.com

"Stephen" wrote:

I tried the following and nothing seemed to have happened. Am I along the
correct lines. Thanks for your help so far I definitely understand how to do
it now, im just having difficulty executing it with the code. Do you have
any idea where I am going wrong. At present when the button is clicked
nothing seems to be happening.

private void DataGrid1_Delet eCommand(object source,
System.Web.UI.W ebControls.Data GridCommandEven tArgs e)
{
ArrayList addresses;
addresses = (ArrayList) ViewState["Addresses"];
string myAddress = e.Item.Cells[0].Text;
addresses.Remov e("myAddress" );
DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}

"Kannan.V" wrote:
hi stephen,

you have to delete the item form the arraylist.
arraylist object provides a remove method, u need to pass the item to be
removed, in your case you can pass the string to be deleted.

Ex.
addresses.Remov e("myAddress" );

your next question might be, how do i get the text from the currently
selected row.

the datagrid has a property called the itemindex which returns the currently
selected row index as an integer.

so to get the text from the first cell in the datagrid that is displaying
your data,
u might have to use something similar to the sample shown below.

e.Item.Cells[0].Text

this returns the text in the first cell in the row where the edit button was
clicked.
pass this text to the remove method of the arraylist.
After removing from the arraylist, rebind the datagrid.

Hope this was helpful to you.
Regds,
http://kannanv.blogspot.com
"Stephen" wrote:
I've got a datagrid with a remove button and I would like to add some code in
the code behind page so as whenthe button is clicked the corresponding row in
the datagrid is removed. The Datagrid is populated by the items in an
arraylist shown in the code below. When the button is clicked I would also
like the code to remove the items from the Arraylist. I've very little
experience working with datagrids and arraylists so im finding this difficult
to do and would really appreciate it if I could get some help from anyone
with this.

I know how to get the event up but not sure what to add into the event below
to achieve what I need to do: -
private void DataGrid1_Delet eCommand(object source,
System.Web.UI.W ebControls.Data GridCommandEven tArgs e)
{

}

This is how I currently create the arraylist and populate the datagrid: -
private void Page_Load(objec t sender, System.EventArg s e)
{
ArrayList addresses;

// when the page is first loaded only
if( !IsPostBack )
{
addresses = new ArrayList(5);
ViewState["Addresses"] = addresses;
}
// on subsequent PostBacks:
else
{
addresses = (ArrayList) ViewState["Addresses"];
if( addresses != null )
{
DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}
}
}

private void Button1_Click(o bject sender, System.EventArg s e)
{
ArrayList addresses;

addresses = (ArrayList) ViewState["Addresses"];

Address newAddress = new Address();
newAddress.Addr ess1 = this.TextBox1.T ext.Trim();
newAddress.Addr ess2 = this.TextBox2.T ext.Trim();
newAddress.Addr ess3 = this.TextBox3.T ext.Trim();
newAddress.Addr ess4 = this.TextBox4.T ext.Trim();
newAddress.Addr ess5 = this.TextBox5.T ext.Trim();
newAddress.Addr ess6 = this.TextBox6.T ext.Trim();
addresses.Add(n ewAddress);
ViewState["Addresses"] = addresses;

DataGrid1.DataS ource = addresses;
DataGrid1.DataB ind();
}

My datagrid code is as follows: -

<asp:DataGrid id="DataGrid1" style="Z-INDEX: 108; LEFT: 73px; POSITION:
absolute; TOP: 306px" runat="server" Width="459px"
AutoGenerateCol umns="false">
<Columns>
<asp:BoundColum n DataField="Addr ess1" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress1" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess2" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress2" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess3" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress3" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess4" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress4" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess5" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress5" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:BoundColum n DataField="Addr ess6" ItemStyle-HorizontalAlign ="Center"
HeaderText="Add ress6" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k" HeaderStyle-ForeColor="Whit e"></asp:BoundColumn >
<asp:ButtonColu mn Text="Remove" ItemStyle-HorizontalAlign ="Center"
HeaderText="" CommandName="Re move" HeaderStyle-HorizontalAlign ="Center"
HeaderStyle-BackColor="blac k"
HeaderStyle-ForeColor="Whit e"></asp:ButtonColum n>
</Columns>
</asp:DataGrid>
Thanks for any help anyone can give me

Jul 21 '05 #4

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