SSIS value of variable not changing - variables

Question

I am new to SSIS . I am trying to use Script Task to get the last modified date and create date of a file. I have declared two variables to read the file path and file name (File_Path,Filename) in my script task as variables with scope as package and datatype as string.
I want to store the create date and modified date to two diff output variables(Create_Date,Last_Updated) with datatype as Datetime.
my code for the script is as follows
FileInfo fileInfo = new FileInfo(Path.Combine(Dts.Variables["File_Path"].Value.ToString(), Dts.Variables["Filename"].Value.ToString()));
if (fileInfo.Exists)
{
// Get file creation date
Dts.Variables["Create_Date"].Value = fileInfo.CreationTime;
// Get last modified date
Dts.Variables["Last_Updated"].Value = fileInfo.LastWriteTime;
}
else
{
Dts.Events.FireWarning(1, Dts.Variables["System::TaskName"].Value.ToString()
, string.Format("File '{0}' does not exist", fileInfo.FullName)
, "", 0);
}```

Answer 1

SSIS has a Design time and a Run time interface.
Variables are created in the Design time space. There you assign data type and a value. There is an explicit Variable's window that you do all of this with.
During run time, the Variables window will still be visible but the values there are not the run-time value. It's just a reference for what the package was initialized with. The actual values of SSIS variables are to be found in the debug windows. I favor the Locals window (Ctrl+Alt+V, L)
From there, expand the Variables node
You can also add explicit logging into your Script tasks. This little bit will enumerate through all the variables you selected for readonly or read/write access and pop off their name and value into the run log. If you're running in Visual Studio, it will show up in the Results tab or the Output window (great place to copy errors for further research or asking on forums). If you're running from the server, these will show in the SSISDB.catalog.operation_messages view (unless you picked an incompatible logging mode)
bool fireAgain = false;
string message = "{0}::{1} : {2}";
foreach (var item in Dts.Variables)
{
Dts.Events.FireInformation(0, "SCR Echo Back", string.Format(message, item.Namespace, item.Name, item.Value), string.Empty, 0, ref fireAgain);
}