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    <p>You're doing it right. I created a basic SSIS package. Has one Variable, FolderPath, type string. There is a single script task that fires an Information event and the contents of that expose the value of the FolderPath variable</p> <p><img src="https://i.stack.imgur.com/NgYIq.png" alt="enter image description here"></p> <p>I then created a basic C# console app like this</p> <pre><code>public class InformationListener : DefaultEvents { public override void OnInformation(DtsObject source, int informationCode, string subComponent, string description, string helpFile, int helpContext, string idofInterfaceWithError, ref bool fireAgain) { //base.OnInformation(source, informationCode, subComponent, description, helpFile, helpContext, idofInterfaceWithError, ref fireAgain); Console.WriteLine(string.Format("{0} {1}", subComponent, description)); } } class Program { static void Main(string[] args) { string sourcePackage = string.Empty; string path = string.Empty; string variableName = string.Empty; string designValue = string.Empty; string newValue = string.Empty; InformationListener listener = null; sourcePackage = @"J:\Src\SO\SSIS\Package.dtsx"; path = @"J:\runtime"; variableName = "User::FolderPath"; listener = new InformationListener(); Application app = new Application(); Package pkg = null; Variable ssisVariable = null; pkg = app.LoadPackage(sourcePackage, null); ssisVariable = pkg.Variables[variableName]; designValue = ssisVariable.Value.ToString(); Console.WriteLine(string.Format("Designtime value = {0}", designValue)); ssisVariable.Value = path; newValue = ssisVariable.Value.ToString(); Console.WriteLine(string.Format("new value = {0}", newValue)); DTSExecResult results = DTSExecResult.Canceled; results = pkg.Execute(null, null, listener, null, null); Console.WriteLine("Press any key to continue"); Console.ReadKey(); } } </code></pre> <p>As you can tell from the variable inspection</p> <p><img src="https://i.stack.imgur.com/myGid.png" alt="enter image description here"></p> <p>and from my print statements</p> <p><img src="https://i.stack.imgur.com/81T3K.png" alt="enter image description here"></p> <p>the design-time value of <code>C:\designTime</code> goes to <code>J:</code> because I forgot to escape my string above but we can pretend it shows <code>J:\runtime</code>.</p> <p>All this said, unless we serialize the package with a call to the <code>SaveToXml</code> method, the value of User::FolderPath resets to the design time value once the object goes out of scope. Permanently updating would look like</p> <pre><code>app.SaveToXml(sourcePackage, pkg, null); </code></pre> <p><strong>OP EDIT</strong> this discussion and examples led me to the answer: <a href="http://social.msdn.microsoft.com/Forums/sqlserver/en-US/dad8e218-1fe0-49db-89da-5715fb6d4b21/sql-2008-r2-ssis-c-script-task-not-setting-variable" rel="nofollow noreferrer">http://social.msdn.microsoft.com/Forums/sqlserver/en-US/dad8e218-1fe0-49db-89da-5715fb6d4b21/sql-2008-r2-ssis-c-script-task-not-setting-variable</a></p>
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    1. POHow to change SSIS variable values in C#
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    1. COThanks for validating the approach is okay. It now leaves me with why the variables are semi-read-only. My in-code value assignments fail as do attempts to edit through the watch window, but drilling in while inspecting the variables allows me to edit.
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    2. COIf you create a super simple example like the above, do you still get the same result? Could it be that there is an expression assigned to the Variable or a configuration that is preventing your assignment from coming through?
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    3. COThanks again. The discussion led me to find the answer I've added. Don't know how many hours of beating my own head against the wall it would've taken otherwise.
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