C # return

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public  void txtMT_TextChanged(object sender, System.EventArgs e)
{

if(this.txtMT.Text =="")
{
MessageBox.Show("²»ÄÜΪ¿Õ");

this.txtMT.Text="0";
return ;

MessageBox.Show("²âÊÔ");
}

}
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---

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if(this.txtMT.Text =="")
{
MessageBox.Show("²»ÄÜΪ¿Õ");

this.txtMT.Text="0";
else
{
MessageBox.Show("²âÊÔ");
}//ÕâÑùºÃÁË

---

ÒýÓÃ

ÎÒÒ²¾õµÃ²»Ó¦ÔÙÔËÐÐShow("²âÊÔ")ÁË£»
if(this.txtMT.Text =="")
{
MessageBox.Show("²»ÄÜΪ¿Õ");

this.txtMT.Text="0";
}
else
{
MessageBox.Show("²âÊÔ");
}//ÕâÑùºÃÁË

°¥£¬´ò´íÁË

---

C# code:
if(this.txtMT.Text !="")
{
}
else
{
MessageBox.Show("²»ÄÜΪ¿Õ");

this.txtMT.Text="0";
return ;