FindControl后报错，还没吃饭和吃完饭的高手请来看看

[PerfectStar]

for(int i=0;i<25;i++)
{
Label t = (Label)FindControl("Label"+i.ToString());
TextBox p = (TextBox)FindControl("TextBox"+i.ToString());
if(t.Text!=""&&p.Text!="")//此行报错：未将对象引用设置到对象的实例
{...........................}

}

[charliecy]

if (t!=null && t.Text!="" && p.Text!="")

[bitsbird]

Response.Write(Label1.Parent.GetType().TOString());