How do I globally declare my connection string in windows forms

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In Windows Forms I want to declare connection string globally for database.

I tried the following

XML

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

    <add key="connectionString" value="data source=KK;database=Windows;user id=sa;password=pwd"/>
    
  </appSettings>
</configuration>

But ConfigurationManager is not available in Windows Forms

How to solve this

Posted 13-Feb-14 2:34am

KUMAR619

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Vedat Ozan Oner 13-Feb-14 9:18am

It is available. Add reference to 'System.Configuration' http://msdn.microsoft.com/en-us/library/wkze6zky.aspx

3 solutions

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Richard MacCutchan · Accepted Answer · 2014-02-13T03:19:00

Solution 1

KUMAR619 wrote:
But ConfigurationManager is not available in Windows Forms

Since when? See http://msdn.microsoft.com/en-us/library/system.configuration.configurationmanager.connectionstrings(v=vs.90).aspx[^].

Posted 13-Feb-14 3:19am

Richard MacCutchan

MashaJoey · Accepted Answer · 2014-02-13T03:27:00

same place where you globally add variables ... just under

C#

public Form1()
        {
            InitializeComponent();
        }

         SqlConnection cn = new SqlConnection(@"Connection string");

this although just global for this form, if you want to put it over all for all forms

SQL

public Form1()
        {
            InitializeComponent();
        }

       public SqlConnection cn = new SqlConnection(@"Connection string");

but i would not use put a connection string as public ... id rather get a get set method going
if you want to change it you only need to call the name you alreaddy set and call new connection like

C#

cn = new SqlConnection(@"new Connection string");

KUMAR619 · Accepted Answer · 2014-02-13T18:15:00

Solution 3

The following code is working fine.

C#

SqlConnection connection=
new SqlConnection(ConfigurationSettings.AppSettings["connectionString"]);

Posted 13-Feb-14 18:15pm