getting problem while inserting data into database using stored procedure?

See more:

ASP.NET

SQL-Server-2008R2

protected void btnregister_Click(object sender, EventArgs e)
{

if (Page.IsValid)
{
string cs = ConfigurationManager.ConnectionStrings["SampleConnectionString"].ConnectionString;

using (SqlConnection con = new SqlConnection(cs))
using(SqlCommand cmd = new SqlCommand("spRegisterUser", con))
{
cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("@Username", txtusername.Text);
cmd.Parameters.AddWithValue("@Password", txtpassword.Text);
cmd.Parameters.AddWithValue("@Email", txtemail.Text);
con.Open();
int count = (int)cmd.ExecuteScalar();
if ( count == -1)
{
Label1.Text = "User id is not avalilable please choose another one";
}
else
{

Response.Redirect("~/Login.aspx");
}

}


and Stored procedure is

CREATE Procedure spRegisterUser   
@Username nvarchar(50),  
@Password nvarchar(50),  
@Email nvarchar(50)  
As  
Begin  
  Declare @Count int  
  Declare @Returncount int  
    
   Select @Count = COUNT(Username)  
   from tblUsers Where Username=@Username  
    
   if @Count > 0   
   Begin  
   Set @Returncount = -1  
   End  
   Else  
   Begin  
   set @Returncount = 1  
   Insert into tblUsers values(@Username,@Password,@Email)  
   End  
   Select @Returncount as ReturnValue  
   End

i don't know iam not getting any exception and the values not getting stored. please help me is there anything wrong with that code