如可获取GridView中某字段的值？

[ly1129]

protected void Button3_Click(object sender, EventArgs e)
{
foreach (GridViewRow gr in GridView1.Rows)
{
string sRowID = Convert.ToString( DataBinder.Eval(gr.DataItem, "ROWID"));
}
}

注:GridView1的字段是databind后自动生成的，其中有ROWID这个字段。但变量sRowID 的值总为"",为什么呢？

[koukoujiayi]

foreach (GridViewRow gr in GridView1.Rows)
{
string sRowID = gr.Cells[列号].Text;
Response.Write(sRowID + "<br />");
}

[wuyq11]

int mysum1 = 0;
int mysum2 = 0;
protected void GridL_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow )
{
DataRowView myrows=(DataRowView)e.Row.DataItem;
mysum1 +=Convert .ToInt32 (myrows[2].ToString ());
mysum2 += Convert.ToInt32(myrows[3].ToString());
}
if (e.Row.RowType == DataControlRowType.Footer)
{
e.Row.Cells[0].Text = "合计";
e.Row.Cells[1].Text = mysum1.ToString();
e.Row.Cells[2].Text = mysum2.ToString();
}
}