Check any error in this code

Hi,
this is my asp.net coding for registration form... i didnt get any error while compiling but after i enter all values when i click that submit buttom nothing happen... that values r not in sql db... i dono why... wats wrong in that..... plz help me frnds.... :)


using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page 

{

    

    protected void Page_Load(object sender, EventArgs e)

    {

        

    }

    protected void DropDownList5_SelectedIndexChanged(object sender, EventArgs e)

    {

    }

    protected void Clear_Click(object sender, EventArgs e)

    {

        TextBox1.Text = "";

        TextBox2.Text = "";

        TextBox3.Text = "";

        TextBox4.Text = "";

        TextBox5.Text = "";

        TextBox6.Text = "";

        TextBox7.Text = "";

        TextBox8.Text = "";

        TextBox9.Text = "";

        TextBox10.Text = "";

        TextBox11.Text = "";

        RadioButtonList1.SelectedValue = null;

        TextBox12.Text = "";

        DropDownList4.SelectedValue = null;

        DropDownList5.SelectedValue = null;

        CheckBox1.Checked = false;

        Label21.Text = "";

    }

    protected void CheckBox1_CheckedChanged(object sender, EventArgs e)

    {

    }

    protected void RadioButton1_CheckedChanged(object sender, EventArgs e)

    {

        

    }

    protected void Button1_Click(object sender, EventArgs e)

    {      

     try

     {

     SqlConnection con = new SqlConnection("Data Source=SARANYA-TS02\\SQLEXPRESS;Initial Catalog=ss;Integrated Security=True");

     string str = "Select E-mail Address from RegistrationForm where E-mail Address='" + TextBox7.Text + "'";

             con.Open();

         SqlCommand cmd1 = new SqlCommand(str,con);

         string emailcheckup = Convert.ToString(cmd1.ExecuteScalar());

     if (emailcheckup == string.Empty || emailcheckup == null)

     {

         SqlCommand cmd = new SqlCommand("insert into RegistrationForm values('" + TextBox1.Text + "','" + TextBox2.Text + "','" + TextBox3.Text + "','" + TextBox4.Text

            + "','" + TextBox5.Text + "','" + TextBox6.Text + "','" + TextBox7.Text + "','" + TextBox8.Text + "','" + RadioButtonList1.SelectedValue

            + "','" + TextBox12.Text + "','" + TextBox9.Text + "','" + TextBox10.Text

            + "','" + TextBox11.Text + "','" + DropDownList4.SelectedValue + "','" + DropDownList5.SelectedValue + "')", con);

         

         cmd.ExecuteNonQuery();

         con.Close();

         Response.Write("");//This is one of javascript alert

       //  DataTable dt = new DataTable(str);

         //if (dt.Rows.Count > 0)

         //{

         //    Label21.Text = "email id already exists.";

         //}

         //else

         //{

         //    Label21.Text = "email ID already exists";

         //    Response.Redirect("E-mail Address already Exists");

         //}

     }

     else

     {

         Label21.Text = "email ID already exists";         

     }

     }

        catch(Exception ex)

        {

            string errormsg = ex.ToString();

        }

        

    }

    protected void RadioButton2_CheckedChanged(object sender, EventArgs e)

    {

        

    }

    protected void TextBox7_TextChanged(object sender, EventArgs e)

    {

        

    }

    protected void TextBox2_TextChanged(object sender, EventArgs e)

    {

    }

    protected void TextBox3_TextChanged(object sender, EventArgs e)

    {

    }

    protected void TextBox9_TextChanged(object sender, EventArgs e)

    {

    }

}