Doesn't show the message box when I press the registration button

  private void Reg_Load(object sender, EventArgs e)
        {
            this.AutoValidate = System.Windows.Forms.AutoValidate.EnableAllowFocusChange;
        }

      
        private void btnRegistration_Click_1(object sender, EventArgs e)
        {
            
            if (this.ValidateChildren())
            {
                //Do registration here
               
                string c = ConfigurationManager.ConnectionStrings["Constr"].ConnectionString;
                SqlConnection con = new SqlConnection(c);
                con.Open();
                SqlCommand cmd = new SqlCommand("RegistrationForm", con);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.AddWithValue("@UserName", txtRegUserN.Text);
                cmd.Parameters.AddWithValue("@Password", txtRegPass.Text);
                cmd.Parameters.AddWithValue("@Confirm", txtRegPassConfirm.Text);
                cmd.Parameters.AddWithValue("@Email", txtRegEmail.Text);
                SqlDataReader dr = cmd.ExecuteReader();
                while (dr.Read())
                {
                    MessageBox.Show("Data Inserted Succesfully");

                }
                con.Close(); 
            }

          else
            {
                var listOfErrors = this.errorProv.ContainerControl.Controls
                                    .Cast<Control>()
                                    .Select(c => this.errorProv.GetError(c))
                                    .Where(s => !string.IsNullOrEmpty(s))
                                    .ToList();
                MessageBox.Show("please correct validation errors:\n - " +
                    string.Join("\n - ", listOfErrors.ToArray()),
                    "Error",
                    MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
       }


        private void txtRegUserN_Validating(object sender, CancelEventArgs e)
        {
            string c = ConfigurationManager.ConnectionStrings["Constr"].ConnectionString;
            SqlConnection con = new SqlConnection(c);
            con.Open();
            SqlCommand cmd = new SqlCommand("UserNameReg", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@UserName", this.txtRegUserN.Text);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                if (dr.HasRows == true)
                {
                    errorProv.SetError(txtRegUserN, "UserName = " + dr[1].ToString() + " Already exist");
                    //e.Cancel = true;
                    txtRegUserN.Clear();
                    //e.Cancel = true;
                    break;
                }
                else
                {
                   //errorProvRi.Icon = Properties.Resources.c;
                    errorProv.Dispose();
                }
            }
        }

        private void txtRegPass_Validating(object sender, CancelEventArgs e)
        {
            if (this.txtRegPass.TextLength < 8)
            {
                this.errorProvRi.Icon = Properties.Resources.w;
                this.errorProv.SetError(this.txtRegPass, "Password must be at least 8 character");
                txtRegPass.Clear();
                //e.Cancel = true;
            }
            else
            {

                //errorProvRi.Icon = Properties.Resources.c;
                errorProv.Dispose();
            }
        }

        private void txtRegPassConfirm_Validating(object sender, CancelEventArgs e)
        {
            if (this.txtRegPassConfirm.Text != this.txtRegPass.Text)
            {
                this.errorProvRi.Icon = Properties.Resources.w;
                this.errorProv.SetError(this.txtRegPassConfirm, "Password and Confirm must be the same");
                txtRegPassConfirm.Clear();
                //e.Cancel = true;
            }
            else
            {
                //this.errorProvRi.Icon = Properties.Resources.c;
                errorProv.Dispose();
             
            }
        }

        private void txtRegEmail_Validating(object sender, CancelEventArgs e)
        {

            //Regex r = new Regex("^[a-zA-Z0-9){1,20}@[a-zA-Z0-9){1,20}.[a-zA-Z]{2,3}$");

            //if (!r.IsMatch(txtRegEmail.Text))
            //{
            //    this.errorProvRi.Icon = Properties.Resources.w;
            //    errorProv.SetError(txtRegEmail, "incorrect formate");
            //    e.Cancel = true;

            //}

            string c = ConfigurationManager.ConnectionStrings["Constr"].ConnectionString;
            SqlConnection con = new SqlConnection(c);
            con.Open();
            SqlCommand cmd = new SqlCommand("EmailReg", con);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@Email", this.txtRegEmail.Text);
            SqlDataReader dr = cmd.ExecuteReader();
            while (dr.Read())
            {
                if (dr.HasRows == true)
                {
                    errorProv.SetError(txtRegEmail, "Email = " + dr[4].ToString() + "is Already exist");
                    txtRegEmail.Clear();
                    //e.Cancel = true;
                    break;
                }
                else
                {
                    //this.errorProvRi.Icon = Properties.Resources.c;
                    errorProv.Dispose();
                }

            }

        } 
    }
}