geting error while connecting sqlserver 2008 to android application in .net

if(password == confirmpassword)
            {
                try
                {
                    SqlConnection connection = new SqlConnection("Data Source=VASPAAN2-PC;Initial Catalog=employee;User ID=sa;Password=2012");
                    connection.Open();
                    SqlCommand cmd = new SqlCommand("insetuser", connection);
                    
                    //SqlCommand cmd=new SqlCommand("insert into tbluser(username,password,address)values(@username,@password,@address)",sql);
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Parameters.AddWithValue("@username", username);
                    cmd.Parameters.AddWithValue("@password", password);
                    cmd.Parameters.AddWithValue("@address", address);
                    cmd.ExecuteNonQuery();
                    AlertDialog.Builder alert = new AlertDialog.Builder(this);
                    alert.SetMessage("data is inserted");
                    alert.Create();
                    alert.Show();
                    connection.Close();
                }
                catch (Exception ex)
                {
                    string err = ex.Message;
                    AlertDialog.Builder alertbox = new AlertDialog.Builder(this);
                    alertbox.SetMessage(err);
                    alertbox.Create();
			        alertbox.Show();
                }
             
            }
            else
            {
                Toast.MakeText(this,"enter does not match", ToastLength.Short).Show();
            }