1.整个页面的判断

foreach(Control ctl in this.Controls[1].Controls)

{

if(ctl.GetType().Name=="TextBox")

{

TextBox tb =new TextBox();

tb=(TextBox)this.FindControl(ctl.ID);

if(tb.Text==string.Empty)

{

Response.Write("");

break;

}

}

}

2.指定formID里TextBox 判断

先找出你的Form的ID

protected HTMLForm yourformID;

foreach (object obj in yourformID.Controls)

{

if (obj is TextBox)

{

TextBox tb = (TextBox)obj;

if (tb.Text = string.Empty)

{

Response.Write(";")

}

}

}