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How to call Stored Procedure and use of ExecuteReader and Excecute Scalar

The following code demonstrates few things in C#.NET:


//CALLING THE STORED PROCEDURE IN SQL SERVER

SqlConnection conn = new SqlConnection("Server=(local);DataBase=Rohit;Integrated Security=SSPI");
            conn.Open();

            int vEmpno;
            String vEname;
            int vSalary;
            //insert command

            //Pick all the values from the textboxes
            vEmpno = Convert.ToInt32(textBox1.Text);
            vEname = textBox2.Text;
            vSalary = Convert.ToInt32(textBox3.Text);


            SqlCommand cmd = new SqlCommand("P1", conn);
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.Parameters.AddWithValue("@vEmpno", vEmpno);
            cmd.Parameters.AddWithValue("@vEname", vEname);
            cmd.Parameters.AddWithValue("@vSalary", vSalary);

            cmd.ExecuteNonQuery();
            MessageBox.Show("Record Saved");
            conn.Close();


How To display the Employee Numbers and Enames from Table for a selected job

SqlConnection conn = new SqlConnection("Server=(local);DataBase=Rohit;Integrated Security=SSPI");
            conn.Open();

            //Get the selected job from Listbox3

            String vSelectedJob = listBox3.SelectedItem.ToString();

            String vQuery = "Select * from Emp where job='"+vSelectedJob+"'";

            SqlCommand cmd = new SqlCommand(vQuery, conn);
            SqlDataReader vDr=cmd.ExecuteReader();
            listBox1.Items.Clear();
            listBox2.Items.Clear();
            while (vDr.Read())
            {
                listBox1.Items.Add(vDr["Empno"]);
                listBox2.Items.Add(vDr["Ename"]);
            }
            conn.Close();


//To get all the distinct jobs from Emp

           SqlConnection conn = new SqlConnection("Server=(local);DataBase=Rohit;Integrated Security=SSPI");
            conn.Open();

            String vQuery = "Select distinct(job) from Emp";

            SqlCommand cmd = new SqlCommand(vQuery, conn);
            SqlDataReader vDr = cmd.ExecuteReader();
            while (vDr.Read())
            {
                listBox3.Items.Add(vDr[0]);
            }
            conn.Close();




//USE OF EXECUTE SCALAR
            SqlConnection conn = new SqlConnection("Server=(local);DataBase=Rohit;Integrated Security=SSPI");
            conn.Open();

            int vEmpno = Convert.ToInt32(textBox1.Text);
            String vQuery = "Select ename from emp where Empno = "+ vEmpno;
           
            SqlCommand cmd = new SqlCommand(vQuery, conn);
            Object vobj = cmd.ExecuteScalar();
            if (vobj == null)
            {
                MessageBox.Show("Sorry no record found");
            }
            else
            {
                textBox2.Text = vobj.ToString();
            }
            conn.Close();  

Happy Coding. Keep on trying

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