Mobile number already exist or not in C#


  1.  mobile number already exists


Private bool CheckMobNoExistOrNot(string MobileNo)
        {
            bool ReturnVal = false;
            try
            {
                if (objCon.State != ConnectionState.Open)
                    ObjCon.Open();
                using (SqlCommand cmd = new SqlCommand("select COUNT(*) from tablename where ContactNo=@MobNo ", ObjCon))
                {

                    cmd.Parameters.AddWithValue("@MobNo", MobileNo);

                    object Obj = cmd.ExecuteScalar();
                    if (Obj != null)
                    {
                        if (Convert.ToInt32(Obj) > 0)
                            ReturnVal = true;
                    }
                }
            }
            catch (Exception ex)
            {
                lblerrmsg.Text = "CheckMobNoExistOrNot" + ex.Message;
            }
            finally
            {
                if (ObjCon.State != ConnectionState.Closed)
                    ObjCon.Close();
            }
            return ReturnVal;
        }

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