Getting a Value From a Datagrid

[Juba]

Hello,

I have the following code placed at my Page_Load event and after the
Datagrid is binded, so it is not empty. The problem is that the variable
isclass is always returning null and I am sure that the Category
ItemTemplate is there and that it is previouly populated. Am I missing
something? Here's the code:

private void Page_Load(objec t sender, System.EventArg s e)
{
if (Page.IsPostBac k == false)
{

// Calculate end-user's shopping cart ID
ShoppingCartDB cart = new ShoppingCartDB( );
String cartId = cart.GetShoppin gCartId();

// Populate datagrid with shopping cart data
MyDataGrid.Data Source = cart.GetItems(c artId);
MyDataGrid.Data Bind();

// I am trying to get the value from my ItemTemplate TextBox here:
TextBox isclass = (TextBox)MyData Grid.FindContro l("Category") ;

if (isclass.Text == "Classes" ) // I am sure this value is there - it is
not finding the control
{
cart.AddItem(ca rtId, 2, 1);
}

}
}
.....

Thanks in advance!

[Scott Allen]

Hi Juba:

If you are using an ItemTemplate in your grid, something like

<ItemTemplate >
<asp:TextBox Runat="server" id="mytextbox"> x</asp:TextBox>
</ItemTemplate>

then click View Source in IE, you'll see ASP.NET prefixed the ID of
each textbox, something like:

<input name="DataGrid1 :_ctl4:mytextbo x" type="text" value="ABBA"
id="DataGrid1__ ctl4_mytextbox" />

Basically, child controls receive a naming prefix from ASP.NET so it
will not render multiple TextBox controls all with the ID of
"Category".

What I have trouble understanding is this. If you have a DataGrid with
multiple rows, how do you know which one to pull data from? If you
have a "Selected" row , you can use FindControl on the parent of the
text box to find a value, i.e:

textbox = (TextBox)MyData Grid.SelectedIt em.FindControl( "Category") ;

Using FindControl on the DataGrid will search with the proper prefix
for the control in question.

Hope this gets you started in the right direction,

--
Scott
http://www.OdeToCode.com

On Fri, 2 Jan 2004 23:05:48 -0500, "Juba" <ju*******@hotm ail.com>
wrote:

Hello,

I have the following code placed at my Page_Load event and after the
Datagrid is binded, so it is not empty. The problem is that the variable
isclass is always returning null and I am sure that the Category
ItemTemplate is there and that it is previouly populated. Am I missing
something? Here's the code:

private void Page_Load(objec t sender, System.EventArg s e)
{
if (Page.IsPostBac k == false)
{

// Calculate end-user's shopping cart ID
ShoppingCartDB cart = new ShoppingCartDB( );
String cartId = cart.GetShoppin gCartId();

// Populate datagrid with shopping cart data
MyDataGrid.Data Source = cart.GetItems(c artId);
MyDataGrid.Data Bind();

// I am trying to get the value from my ItemTemplate TextBox here:
TextBox isclass = (TextBox)MyData Grid.FindContro l("Category") ;

if (isclass.Text == "Classes" ) // I am sure this value is there - it is
not finding the control
{
cart.AddItem(ca rtId, 2, 1);
}

}
}
....

Thanks in advance!