private void button1_Click(object sender, EventArgs e)
        {
           if(this.textBox1.Text.Trim() !="" && this.textBox2.Text.Trim() !="")
           {

               string passWordOnew = GetMd5(this.textBox1.Text.Trim());
               string passWordTOew = GetMd5(this.textBox2.Text.Trim());
               if(passWordOnew == passWordTOew)
               {
                   this.label1.Text = "密码相同";
                   return;
               }
               this.label1.Text = "密码不相同";
               this.textBox1.Focus();

           }

        }
        public string GetMd5(string str)
        {

            byte[] passWord = Encoding.Default.GetBytes(str);
            MD5 passWordMd5 = new MD5CryptoServiceProvider();
            byte[] newsPassWord = passWordMd5.ComputeHash(passWord);
            return BitConverter.ToString(newsPassWord).Replace("-", "").ToLower();
        }