GridView中TextBox取值问题

[dropping]

TextBox部分代码:
<asp:TemplateField HeaderText="Userid">
<ItemTemplate>
<asp:TextBox ID="txtUserid" runat="server" Width="90px" />
</ItemTemplate>
</asp:TemplateField>

CS文件部分代码:
TextBox t1 = (TextBox)GridView1.Rows[0].Cells[0].FindControl("txtUserid");
//string t1 = ((LiteralControl)GridView1.Rows[0].Cells[0].Controls[0]).Text.Trim();
这两种方法取到的都是空值.
何解？

[sendling]

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
TextBox t1 = (TextBox)e.Row.FindControl("txtUserid");

}
}

[panqiangsuper]

((TextBox)GridView1.Rows[0].Cells[0].FindControl("txtUserid")).text.tostring()

[panqiangsuper]

o 看错了!!!
呵呵
丢人了

[sendling]

用这种试下
还有你取值的时候用t1.Text,而不是t1,t1是文本框id

[dropping]

TO:sendling(心随我动)
我是用来批量添加的啦。
Load事件创建一个空datatable：
DataTable dt = new DataTable();
for (int i = 0; i < 3; i++)
{
DataRow dr = dt.NewRow();
dt.Rows.Add(dr);
}
GridView1.DataSource = dt;
GridView1.DataBind();

[晓风残月0110]

rowcommand中
GridViewRow InforGridViewRow = (GridViewRow)((Control)e.CommandSource).Parent.Parent;
Label lbPerson_ID = InforGridViewRow.FindControl("lbPerson_ID") as Label;
rowdatabound 中
if (e.Row.RowType == DataControlRowType.DataRow)
}
LinkButton LinkContent = ((LinkButton)(e.Row.Cells[1].FindControl("LKContent")));
}

[dropping]

OK！解决了。
string t1 = this.Request.Form[GridView1.Rows[i].Cells[0].FindControl("txtUserid").ClientID.Replace('_', '$')];