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I am using app.config file for define connectionstring;
how to edit line of connectionstring code in app.config in runed program?
Posted 18-Feb-13 3:15am
Edited 18-Feb-13 3:31am
IpsitaMishra at 18-Feb-13 8:22am
What exactly your requirement is ??? do you want to get different connection string at different server ..or something else....please specify your requirement .....
Devang Vaja at 19-Feb-13 0:14am
Ipsita i think he want to change connection string in running program...
Ofcousrse You can change connection string but you have to refresh the page after changing connctionstring....
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Solution 2

hi dear
use below function
private bool savesattings(string key, string value)
               System.Configuration.Configuration lobjconfig = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
               lobjconfig.AppSettings.Settings.Add(key, value);
               return true;
               return false;
private void btnChange_Click(object sender, EventArgs e)
            savesattings("DemoKey", "MyValue");
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Solution 1

// Retrieve a connection string by specifying the providerName.
// Assumes one connection string per provider in the config file.
static string GetConnectionStringByProvider(string providerName)
// Return null on failure.
string returnValue = null;
// Get the collection of connection strings.
ConnectionStringSettingsCollection settings =
// Walk through the collection and return the first
// connection string matching the providerName.
if (settings != null)
foreach (ConnectionStringSettings cs in settings)
if (cs.ProviderName == providerName)
returnValue = cs.ConnectionString;
return returnValue;
For more details, refer below link[^]

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