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Using server side binding for GridTemplateColumns
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This is a migrated thread and some comments may be shown as answers.
William
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William asked on 25 Oct 2018, 09:47 PM

I'm using the advanced data binding technique from https://demos.telerik.com/aspnet-ajax/grid/examples/data-binding/simple-vs-advanced/defaultvb.aspx .  However, I need to use GridTemplateColumns to format some of the columns ( <%#String.Format("{0} - {1}", Eval("user"), Eval("name")) %> ) and because I'm using these, nothing comes up.  Is there a way to do this?  If not, is there a better solution?  I did copy the example exactly, but used my datatable instead and it came up, but gave me every single column.  I know I can remove columns, but this doesn't allow me to format columns like I do with GridTemplateColumns.

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Attila Antal
Telerik team
answered on 30 Oct 2018, 02:32 PM
Hi William, 

It would be helpful if you could give us a little more details about the grid settings/markup/code behind. The following code snippet is an example that is bound to DataTable with Dummy data and evaluating of the field is working well.

<telerik:RadGrid ID="RadGrid1" runat="server" AllowPaging="True" CellSpacing="0"
    GridLines="None" Width="800px" OnNeedDataSource="RadGrid1_NeedDataSource">
    <MasterTableView AutoGenerateColumns="False" DataKeyNames="OrderID">
        <Columns>
             <telerik:GridTemplateColumn HeaderText="My Template Column" UniqueName="MyTemplateColumn">
                 <ItemTemplate>
                     <telerik:RadLabel ID="RadLabel1" runat="server"
                         Text='<%#String.Format("You order with id {0} was received at {1}", Eval("OrderID"), Eval("OrderDate")) %>'>
                     </telerik:RadLabel>
                 </ItemTemplate>
            </telerik:GridTemplateColumn>
        </Columns>
    </MasterTableView>
</telerik:RadGrid>

C# - Code behind:
protected void RadGrid1_NeedDataSource(object sender, GridNeedDataSourceEventArgs e)
{
    RadGrid1.DataSource = GetGridSource();
}
private DataTable GetGridSource()
{
    DataTable dataTable = new DataTable();
 
    DataColumn column = new DataColumn();
    column.DataType = Type.GetType("System.Int32");
    column.ColumnName = "OrderID";
    dataTable.Columns.Add(column);
 
    column = new DataColumn();
    column.DataType = Type.GetType("System.DateTime");
    column.ColumnName = "OrderDate";
    dataTable.Columns.Add(column);
 
    column = new DataColumn();
    column.DataType = Type.GetType("System.Decimal");
    column.ColumnName = "Freight";
    dataTable.Columns.Add(column);
 
    column = new DataColumn();
    column.DataType = Type.GetType("System.String");
    column.ColumnName = "ShipName";
    dataTable.Columns.Add(column);
 
    column = new DataColumn();
    column.DataType = Type.GetType("System.String");
    column.ColumnName = "ShipCountry";
    dataTable.Columns.Add(column);
 
    DataColumn[] PrimaryKeyColumns = new DataColumn[1];
    PrimaryKeyColumns[0] = dataTable.Columns["OrderID"];
    dataTable.PrimaryKey = PrimaryKeyColumns;
 
    for (int i = 0; i <4; i++)
    {
        DataRow row = dataTable.NewRow();
        row["OrderID"] = i + 1;
        row["OrderDate"] = DateTime.Now;
        row["Freight"] = (i + 1) + (i + 1) * 0.1 + (i + 1) * 0.01;
        row["ShipName"] = "Name " + (i + 1);
        row["ShipCountry"] = "Country " + (i + 1);
 
        dataTable.Rows.Add(row);
    }
 
    return dataTable;
}

Ultimately you can check out the attached project to see it in action. (Telerik assemblies are excluded to keep the attachment size at minimum).

Kind regards,
Attila Antal
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Attila Antal
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