为什么formview里找不到我的控件

[seyon2]

我的formview的insertmode里面有个id=billtextbox的textbox,但是我的formview的defaultmode是readonly,我想在readonly下点击新增转到insertmode自动往那个textbox里面写个值,始终说我没有实例化对象,我在ModeChanged事件和OnPreRender事件里写都是这样,请问应该怎么写啊?
protected void FormView1_ModeChanged(object sender, EventArgs e)
{
if (FormView1.CurrentMode == FormViewMode.Insert)
{
TextBox l = FormView1.Row.FindControl("billnoTextBox") as TextBox;
l.Text = "2f";
}
}

override protected void OnPreRender(EventArgs e)
{
if (FormView1.CurrentMode == FormViewMode.Insert)
{
TextBox l = FormView1.Row.FindControl("billnoTextBox") as TextBox;
l.Text = "2f";
}


}

[seyon2]

不行,试过了

[悟w]

试一下TextBox l = FormView1.FindControl("billnoTextBox") as TextBox

[xuxiaobo2005]

我也有这个困惑
如果点commandName="Insert"状态转过去，就能FindControl到
ChangeMode(FormViewMode.Insert)转过去后就找不到控件

[jxf654]

up