Accessing database connection string using app.config in C# winform

Question

I can\'t seem to be able to access the app.config database connection string in my c# winforms app.

app.config code

Answer 1

This is all you need:

System.Configuration.ConfigurationManager.ConnectionStrings["MyDBConnectionString"].ConnectionString;

Answer 2

<?xml version="1.0" encoding="utf-8" ?>
<configuration>

<appSettings>

<add key="ConnectionString" value="Data Source=MY-PC;Initial Catalog=DB2013;User ID=sa;Password=MYSQL123" />

</appSettings>

</configuration>
using System.Configuration;
using System.Data.SqlClient;

namespace OnlineDelete_W2013
{
public partial class CommodityEdit : Form
{
   SqlConnection MyConnection = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"]);

    public CommodityEdit()
    {
        InitializeComponent();

    }

    private void button1_Click(object sender, EventArgs e)
    {
        try
        {
           MyConnection.Open();
        }
        catch (Exception)
        {

            throw;
        }

Answer 3

You are using the ConnectionStrings collection, not the AppSettings.

ConfigurationManager.ConnectionStrings["MyDbConnectionString"].ConnectionString;

Answer 4

try this

 ConfigurationManager.ConnectionStrings["MyDbConnectionString"].ConnectionString; 

Answer 5

About this:

I get an error: Only assignment, call, increment, decrement, and new object expressions can be used as a statement

I just declared a var like this and solved the problem:

var strConnection = System.Configuration.ConfigurationManager.ConnectionStrings["MyDBConnectionString"].ConnectionString;

Answer 6

SqlConnection conn = new SqlConnection();
conn.ConnectionString = ConfigurationManager
    .ConnectionStrings["MyDBConnectionString"].ConnectionString;
try
{
    conn.Open();                
}
catch (Exception)
{
    throw;                    
}