Execute Multiple queries in Windows Aplication using C# and VB.Net

Hi Akram.19,

Please refer below sample.

DataBase

Note: For this example I have used of Northwind database that you can download using the link given below.

Download Northwind Database

Namespaces

C#

using System.Data.SqlClient;
using System.Configuration;

VB.Net

Imports System.Data.SqlClient
Imports System.Configuration

Code

C#

private void Form1_Load(object sender, EventArgs e)
{
    string query = "SELECT Top 3 CustomerID, ContactName, Country FROM Customers;";
    query += "SELECT Top 3 EmployeeId, FirstName, Country FROM Employees";
    string conString = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
    using (SqlConnection con = new SqlConnection(conString))
    {
        using (SqlCommand cmd = new SqlCommand(query, con))
        {
            using (SqlDataAdapter sda = new SqlDataAdapter(cmd))
            {
                using (DataSet ds = new DataSet())
                {
                    sda.Fill(ds);
                    dgvCustomers.DataSource = ds.Tables[0];
                    dgvEmployees.DataSource = ds.Tables[1];
                }
            }
        }
    }
}

VB.Net

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    Dim query As String = "SELECT Top 3 CustomerID, ContactName, Country FROM Customers;"
    query += "SELECT Top 3 EmployeeId, FirstName, Country FROM Employees"
    Dim conString As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
    Using con As SqlConnection = New SqlConnection(conString)
        Using cmd As SqlCommand = New SqlCommand(query, con)
            Using sda As SqlDataAdapter = New SqlDataAdapter(cmd)
                Using ds As DataSet = New DataSet()
                    sda.Fill(ds)
                    dgvCustomers.DataSource = ds.Tables(0)
                    dgvEmployees.DataSource = ds.Tables(1)
                End Using
            End Using
        End Using
    End Using
End Sub

Screenshot