how to calculate sum of total in grid and display in label

Hi,

Hope the below given code snippet might help you

protected void Gridview1_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowType == DataControlRowType.DataRow)
        {
            if (DataBinder.Eval(e.Row.DataItem, "COLUMNNAME") != DBNull.Value)
            {
                var_sum = Convert.ToInt32(DataBinder.Eval(e.Row.DataItem, "COLUMNNAME"));
            }
        }
        if (e.Row.RowType == DataControlRowType.Footer)
        {
            e.Row.Cells[2].Text = var_sum;
        }
    }