Multiple controls with the same ID 'FilterTextBox_?? when using UniqueName

[Bob]

I have created a Grid ServerSide.  The first time the grid loads it is fine, but any time a subsequent load happens I get the above error for any column where I am trying to set a UniqueName.  I am clearing out all columns before new ones are created so I don't see why I am getting this.  Here is a snippit of my code:

// Clear all Grid Columns to start from scratch
RadGrid.MasterTableView.Columns.Clear();

foreach (string column in columns)
{
    if (column.ToLower() == "recordid")
    {
        RadGrid.MasterTableView.ClientDataKeyNames = new string[] { column };
        RadClientDataSource1.Schema.Model.ID = column;
        continue;
    }

    GridBoundColumn col = new GridBoundColumn()
    {
        DataField = column,
        UniqueName = column,
        HeaderText = column.Replace("_", " "),
        FilterDelay = 300
    };

    RadGrid1.MasterTableView.Columns.Add(col);
}

[Eyup]

Hi Bob,

There is no need to clear the columns so please remove this line. Also, make sure that you are creating the grid entirely on code-behind during the Page_Init event handler as demonstrated in the following section:
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/defining-structure/creating-a-radgrid-programmatically#creating-a-radgrid-on-page_init

If you want to change the columns dynamically, please follow the steps explained in this article:
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/defining-structure/changing-the-grid-structure-dynamically-on-postback

I hope this will prove helpful.

Regards,
Eyup
Progress Telerik