Read ConnectionStrings from Class File using C# and VB.Net in ASP.Net

Hi SUJAYS,

HTML

<asp:GridView runat="server" AutoGenerateColumns="false" ID="gvCustomers">
    <Columns>
        <asp:BoundField DataField="CustomerId" HeaderText="CustomerId" />
        <asp:BoundField DataField="Name" HeaderText="Name" />
        <asp:BoundField DataField="Country" HeaderText="Country" />
    </Columns>
</asp:GridView>

Namespaces

C#

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

VB.Net

Imports System.Data.SqlClient
Imports System.Data

Code

C#

Connection.cs

using System.Configuration;

public class Connection
{
    public string GetConnectionString()
    {
        string constring = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        return constring;
    }
}

CS.aspx.cs

protected void Page_Load(object sender, EventArgs e)
{
    if (!this.IsPostBack)
    {            
        Connection connectioString = new Connection();
        using (SqlConnection con = new SqlConnection(connectioString.GetConnectionString()))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT * FROM Customers", con))
            {
                using (SqlDataAdapter da = new SqlDataAdapter(cmd))
                {
                    DataTable dt = new DataTable();
                    da.Fill(dt);
                    this.gvCustomers.DataSource = dt;
                    this.gvCustomers.DataBind();
                }
            }
        }
    }
}

VB.Net

ConnectionVB.vb

Imports Microsoft.VisualBasic
Imports System.Configuration

Public Class ConnectionVB
    Public Function GetConnectionString() As String
        Dim constring As String = ConfigurationManager.ConnectionStrings("constr").ConnectionString
        Return constring
    End Function
End Class

VB.aspx.vb

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
    If Not Me.IsPostBack Then
        Dim connectioString As ConnectionVB = New ConnectionVB()
        Using con As SqlConnection = New SqlConnection(connectioString.GetConnectionString())
            Using cmd As SqlCommand = New SqlCommand("SELECT * FROM Customers", con)
                Using da As SqlDataAdapter = New SqlDataAdapter(cmd)
                    Dim dt As DataTable = New DataTable()
                    da.Fill(dt)
                    Me.gvCustomers.DataSource = dt
                    Me.gvCustomers.DataBind()
                End Using
            End Using
        End Using
    End If
End Sub

Screenshot