C#

 private void button2_Click(object sender, EventArgs e)
        {
//#----------put the email here and regcode and make the condition true;
            CheckRegistration("your email here@any.com", "your reg code here");

        }







        public bool CheckRegistration(string _regMail, string _regCode)
        {
            bool flag = false; 
            non = _regCode;
            
//#---------- you have to make this condition true          
            if (((_regMail.Length > 5) && (_regCode.Length > 7)) && GetRegCode(_regMail).Equals(_regCode))
            {
                flag = true;
                int k = 0;
            }
            
   //#---------    Make this flag true...!

            MessageBox.Show(flag.ToString());
         return flag;
        
        }
     
        private static int ConvReg(char _c)
        {
            int num = 0x2a;
            char[] chArray = new char[] { 
                'q', '1', 'c', 'a', 'x', 'l', '-', '7', 'u', 'd', '3', 'b', '2', '9', 'n', 'g', 
                'f', 'v', 't', 'j', 'k', '5', 'm', 'e', 'o', 'p', '6', '@', 's', 'i', '8', 'h', 
                'w', '4', 'y', '_', '0', 'r', '.', 'z'
             };
            for (int i = 0; i < chArray.Length; i++)
            {
                if (_c == chArray[i])
                {
                    num = i;
                }
            }
         //   MessageBox.Show(num.ToString());
            return num;

        }


       public static string GetRegCode(string _regMail)
        {
            string str = "2X";
            if (_regMail.Length > 5)
            {
                char[] chArray = _regMail.ToLower().ToCharArray();
                int index = _regMail.IndexOf("@");
                str = (((str + ConvReg(chArray[0]).ToString()) + ConvReg(chArray[1]).ToString() + ConvReg(chArray[index - 1]).ToString()) + _regMail.Length.ToString() + ConvReg(chArray[index + 1]).ToString()) + ConvReg(chArray[index + 2]).ToString() + ConvReg(chArray[_regMail.Length - 1]).ToString();
            }
        // MessageBox.Show(str+" <-->"+non);
            return str;
        }

public static DataSet execute_DataTable(String SQL_Command_String)
{

    String connectionString;

    connectionString = getConnectionString(@"..\xml_Settings\DB_Connect.xml");
    makeConnection(connectionString);

    DataSet dsResults = new DataSet();
    try
    {
        SqlDataAdapter dbAdapter = new SqlDataAdapter(SQL_Command_String, dbConn);
        dbAdapter.Fill(dsResults, "Results");
    }
    catch (Exception exp)
    {
        throw new Exception(exp.Message + " " + exp.StackTrace, exp);
    }
    finally
    {
        dbConn.Close();
    }
    return dsResults;
}