Need a help to pass parameter into ExecuteScalar

var orderExists = (Int32)ChkavailbleJobCMD.ExecuteScalar() > 0;

protected void LinkButton4_Click(object sender, EventArgs e)
        {
            JobsMView.ActiveViewIndex = 2;

            using (var UsOrderCon = new SqlConnection(cs))
            {
                UsOrderCon.Open();

                string chksBervJobsSt = "Select JobNum, Jobtitle, Dept, VacCountry, Employer from jobs where Employer=@Emp";

                SqlCommand ChkavailbleJobCMD = new SqlCommand(chksBervJobsSt, UsOrderCon);

                ChkavailbleJobCMD.Parameters.AddWithValue("@Emp", "Berava");

                var orderExists = (Int32)ChkavailbleJobCMD.ExecuteScalar() > 0;


                if (orderExists)
                {
                    jobsAvaPan.Visible = true;

                    SqlDataAdapter BervJonavaADPA = new SqlDataAdapter("SELECT JobNum, Jobtitle, Dept, VacCountry, Employer FROM jobs WHERE Employer = @Emp ", cs);

                    BervJonavaADPA.SelectCommand.Parameters.AddWithValue("@Emp", "Berava");

                    DataSet BervJonavaDST = new DataSet();
                    BervJonavaADPA.Fill(BervJonavaDST);
                    GridView1.DataSource = BervJonavaDST.Tables[0];
                    GridView1.DataBind();

                }
                else
                {
                    NoJobAvPan.Visible = true;
                    NoJobLbl.Text = "Sorry, we don't have any job available at the moment";
                }
            }
        }