how to approve user by sending verificaton email - asp.net

Question

i have problem durin verifying user by email...here is my code for registtration page..
protected void btnsignup_Click(object sender, EventArgs e)
{
MailMessage msg;
//SqlCommand cmd = new SqlCommand();
string ActivationUrl = string.Empty;
string emailId = string.Empty;
try
{
//Sending activation link in the email
msg = new MailMessage();
SmtpClient smtp = new SmtpClient();
emailId = txtemail.Text.Trim();
//sender email address
msg.From = new MailAddress("xyz#gmail.com");
//Receiver email address
msg.To.Add(emailId);
msg.Subject = "Confirmation email for account activation";
//For testing replace the local host path with your lost host path and while making online replace with your website domain name
ActivationUrl = Server.HtmlEncode("http://localhost:51049/ActivateAccount.aspx?CustomerId=" + FetchUserId(emailId) + "&EmailId=" + emailId);
msg.Body = "Hi " + txtName.Text.Trim() + "!\n" +
"Thanks for showing interest and registring in <a href='Home.aspx'> e2e website <a> " +
" Please <a href='" + ActivationUrl + "'>click here to activate</a> your account and enjoy our services. \nThanks!";
msg.IsBodyHtml = true;
smtp.Credentials = new NetworkCredential("xyz#gmail.com", "xxxxxx");
smtp.Port = 587;
smtp.Host = "smtp.gmail.com";
smtp.EnableSsl = true;
smtp.Send(msg);
if (result > 0)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "Message", "alert('Confirmation Link to activate your account has been sent to your email address');window.location='LoginPage.aspx'", true);
ClearControl(this);
}
else
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "popup", "alert('Account has not been created.');'", true);
}
}
catch (Exception ex)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "Message", "alert('Error occured : " + ex.Message.ToString() + "');", true);
return;
}
finally
{
con.Close();
}
}
protected string FetchUserId(string emailId)
{
SqlCommand cmd = new SqlCommand("select CustomerId from tbl_CustomerRegistration WHERE CustomerEmail=#CustomerEmail", con);
cmd.Parameters.AddWithValue("#CustomerEmail", emailId);
string CustomerId = cmd.ExecuteScalar().ToString();
return CustomerId;
}
and code for ActivateMyAccount.aspx...
SqlCommand cmd = new SqlCommand();
try
{
if ((!string.IsNullOrEmpty(Request.QueryString["CustomerId"])) & (!string.IsNullOrEmpty(Request.QueryString["CustomerEmail"])))
{
//approve account by setting Is_Approved to 1 i.e. True in the sql server table
cmd = new SqlCommand("UPDATE tbl_CustomerRegistration SET Is_Approved=1 WHERE CustomerId=#CustomerId AND CustomerEmail=#CustomerEmail", con);
cmd.Parameters.AddWithValue("#CustomerId", Request.QueryString["CustomerId"]);
cmd.Parameters.AddWithValue("#CustomerEmail", Request.QueryString["CustomerEmail"]);
if (con.State == ConnectionState.Closed)
{
con.Open();
}
int result= cmd.ExecuteNonQuery();
if(result>0)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "Message", "alert('Your account has been activated. You can login now');window.location='LoginPage.aspx'", true);
}
}
}
catch (Exception ex)
{
ScriptManager.RegisterStartupScript(this, this.GetType(), "Message", "alert('Error occured : " + ex.Message.ToString() + "');", true);
return;
}
finally
{
con.Close();
cmd.Dispose();
}
}
user is getting email after registration but the problem is when user click on verify link then a field in database name as Is_Aprroved is not gettting updated ...thank u ..please help me