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copied!<p>Yes it's possible, but AFAIK only via Reflection. The following code should do what you need (read below for usage):</p> <pre><code>public static string SetConnectionString(Type assemblyMember, Type settingsClass, string newConnectionString, string connectionStringKey) { Type typSettings = Type.GetType(Assembly.CreateQualifiedName(assemblyMember.Assembly.FullName, settingsClass.FullName)); if (typSettings == null) { return null; } PropertyInfo prpDefault = typSettings.GetProperty("Default", BindingFlags.Static | BindingFlags.Public); if (prpDefault == null) { return null; } object objSettings = prpDefault.GetValue(null, null); if (objSettings == null) { return null; } // the default property, this[], is actually named Item PropertyInfo prpItem = objSettings.GetType().GetProperty("Item", BindingFlags.Instance | BindingFlags.Public); if (prpItem == null) { return null; } object[] indexerName = { connectionStringKey }; string oldConnectionString = (string)prpItem.GetValue(objSettings, indexerName); prpItem.SetValue(objSettings, newConnectionString, indexerName); return oldConnectionString; } </code></pre> <p><code>assemblyMember</code> is the calling type<br> <code>settingsClass</code> is the type of your settings class<br> <code>newConnectionString</code> is the full string to set<br> <code>connectionStringKey</code> is the name of the connection string that you defined in your app's settings</p> <p>You should call this method as soon as possible after your app has started, preferably in the Main() method.</p>

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