register button has no function - asp.net

Question

Suddenly my register button is not performing any action other that validations. any idea?
here is my registration.aspx.cs:
protected void Page_Load(object sender, EventArgs e)
{
}
SqlConnection con = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True");
SqlCommand cmd = new SqlCommand();
protected void btnSubmit_Click(object sender, EventArgs e)
{
if(Page.IsValid)
{
cmd.Connection = con; //assigning connection to command
cmd.CommandType = CommandType.Text; //representing type of command
cmd.CommandText = "INSERT INTO UserData values(#Username,#Firstname,#Lastname,#Email,#Password,#CustomerType,#DeliveryAddress,#Zip,#ContactNumber)";
//adding parameters with value
cmd.Parameters.AddWithValue("#Username", txtUser.Text);
cmd.Parameters.AddWithValue("#Firstname", txtFN.Text);
cmd.Parameters.AddWithValue("#Lastname", txtLN.Text);
cmd.Parameters.AddWithValue("#Email", txtEmail.Text);
cmd.Parameters.AddWithValue("#Password", (txtPW.Text));
cmd.Parameters.AddWithValue("#CustomerType", RadioButtonList1.SelectedItem.ToString());
cmd.Parameters.AddWithValue("#DeliveryAddress", txtAddress.Text);
cmd.Parameters.AddWithValue("#Zip", txtZip.Text);
cmd.Parameters.AddWithValue("#ContactNumber", txtContact.Text);
con.Open(); //opening connection
cmd.ExecuteNonQuery(); //executing query
con.Close(); //closing connection
label_register_success.Text = "Registered Successfully..";
}
else
{
label_register_success.Text = "Please check the registration errors";
}
}
protected void ValidateUserName(object source, ServerValidateEventArgs arguments)
{
string UserName = arguments.Value;
using (SqlConnection con = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True"))
{
SqlCommand cmd = new SqlCommand("SELECT * FROM UserData WHERE Username=#Username", con);
cmd.Parameters.AddWithValue("#Username", UserName);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
if (reader.HasRows)
{
arguments.IsValid = false;
}
else
{
arguments.IsValid = true;
}
}
}
protected void ValidateEmail(object source, ServerValidateEventArgs arguments)
{
string Email = arguments.Value;
using (SqlConnection con = new SqlConnection("Data Source = 'PAULO'; Initial Catalog=ShoppingCartDB;Integrated Security =True"))
{
SqlCommand cmd = new SqlCommand("SELECT * FROM UserData WHERE Email=#Email", con);
cmd.Parameters.AddWithValue("#Email", Email);
con.Open();
SqlDataReader reader = cmd.ExecuteReader();
if (reader.HasRows)
{
arguments.IsValid = false;
}
else
{
arguments.IsValid = true;
}
Its not performing the successful registration and the validations for the repeated username and email. please help me out, thanks!

Answer 1

Try triggering the validation via:
Page.Validate();
And pass in any validation groups you use as the parameter (if applicable) before checking IsValid, and see if that detects the errors. I assume your Validate methods are called from CustomValidator controls?