ASP.NET

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
	//Option 1: Use the column header text.
        DataControlField column = GetColumnByHeaderText(GridView1.Columns, "ColumnHeaderText");
        e.Row.Cells[GridView1.Columns.IndexOf(column)].Text = "some text";
                      
	//Option 2: Simply use the FindControl method.
        Label label = e.Row.FindControl("Label1") as Label;
        label.Text = "some text";
    }
}
            
private DataControlField GetColumnByHeaderText(DataControlFieldCollection columns, string headerText)
{
    IEnumerator enumerator = columns.GetEnumerator();
    while (enumerator.MoveNext())
    {
        DataControlField column = enumerator.Current as DataControlField;
        if (column.HeaderText == headerText)
            return column;
    }
                
    return null;
}