Often, you need to see the current value of a variable in SSIS. There are several ways to accomplish this, but my favorite is the Message Box. You can use either VB or C# to display the value of a variable.
First, enable the variable as a read write or read only variable from the Script Task Editor settings:
Lastly use the code below to display the current value in a Script Task:
Public Sub Main()
' Add your code here
Dts.TaskResult = ScriptResults.Success
This is all it takes to display a quick, informative message as seen below.