Question

My GridView contains 20 columns which are added programmatically (DataTable, DataColumn, DataRow and DataSet). Now I need to insert a checkbox column as the last column (21^st column). How should I add it?

I tried adding with the usual Template Field (from design tab) in .aspx file but that adds a checkbox as the first column and not as the last one.

Answer 1

If you are binding your GridView using a DataTable, do this before you set the GridView DataSource.

dataTable.Columns.Add("Select", Type.GetType("System.Boolean"));

DemoGrid.DataSource = dataTable;
DemoGrid.DataBind();

foreach (GridViewRow row in DemoGrid.Rows)
{
    //check box is the first control on the last cell.
    CheckBox check = row.Cells[row.Cells.Count - 1].Controls[0] as CheckBox;
    check.Enabled = true;
}

On an unrelated side note, please note that your asp:GridView is in fact AutoGenerated.