C# 检测Email格式是否正确,C# 2005检测Email格式

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using System.Text.RegularExpressions;
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        bool IsValidEmail(string strIn)
        {
            return Regex.IsMatch(strIn, @"^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");
        }

       private void button1_Click(object sender, EventArgs e)
       {
               if(IsValidEmail(textbox1.text))
               {
                       MessageBox.Show("Email格式正确!");
               }
               else
               {
                       MessageBox.Show("格式不正确，请重新输入!");
               }
       }