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Saturday, 23 April 2016

Retrieve Connection String From Web.config In ASP.net Using C#.Net (AppSettings,ConnectionStrings)

4/23/2016 - By Pranav Singh 0

This article will show you how you can retrieve the connection string value defined in appsettings and connectionstrings tag in your web.config file in asp.net application using c#.net.

So for this article first we will create a new asp.net application and add the below code into your web.config file.

<?xml version="1.0"?>
<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
  </system.web>
  <appSettings>
    <add key="myconnectionstring" value="Data Source=Server;Integrated Security=true;Initial Catalog=DBappSettings"/>
  </appSettings>
  <connectionStrings>
    <add name="myconnectionstring" connectionString="Data Source=Server;Integrated Security=true;Initial Catalog=DBConnectionStrings"/>
  </connectionStrings>
</configuration>


In above code please check the appsettings and connectionstrings. Now I will tell you how you will retrieve the value from web.config file.

Now add a new web page and add the below code into the page.

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication3.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Retrieve Connection String From Web.config In ASP.net Using C#.Net (AppSettings,ConnectionStrings) </title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <asp:Button ID="Button1" runat="server" Text="From AppSettings" OnClick="Button1_Click" />
            &nbsp;<asp:Button ID="Button2" runat="server" Text="From ConnectionStrings" OnClick="Button2_Click" />
            <br />
            <br />
            AppSettings Value:
            <asp:Label ID="Label1" runat="server" Text="Label" style="font-weight: 700"></asp:Label>
            <br />
            ConnectionStrings Value:
            <asp:Label ID="Label2" runat="server" Text="Label" style="font-weight: 700"></asp:Label>
        </div>
    </form>
</body>
</html>

Now generate the button click event and add the below code.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication3
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            string val = System.Configuration.ConfigurationManager.AppSettings["myconnectionstring"].ToString();
            Label1.Text = val;
        }

        protected void Button2_Click(object sender, EventArgs e)
        {
            string val = System.Configuration.ConfigurationManager.ConnectionStrings["myconnectionstring"].
ToString();
            Label2.Text = val;

        }
    }
}

In  above code i have retrieve the appsettings and connectionstrings on button click and display into the label control. Now we have done run the application to check the output.









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