验证当前表单控件的值 是否为空

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("<script>alert('" + ctl.ID + "的值为空。');</script>"); 

   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("<script>alert('" + tb.ID + "的值为空。');</script>;") 

   } 

   } 

  } 

 ------------

foreach (Control cur in Controls)

{

    if (cur is TextBox && cur.Text == string.Empty)

    {

        cur.Text = "0";

    }

}

----

foreach(Control c in this.controls)

{

  if(c is TextBox)

    {

        TextBox tb=(TextBox)c；

        tb.Text=String.empty；   

    }

}

 -----------

 你将所有的TextBox放在form表单中，直接遍历就行了

foreach(Control c in this.form.controls)

{

if(c is textbox)

{

(c as Textbox).Text="1";

}

}