You can assign a value to a user-defined workflow variable with the Assignment task. To use an Assignment task in the workflow, first create and add the Assignment task to the workflow. Then configure the Assignment task to assign values or expressions to user-defined variables. After you assign a value to a variable using the Assignment task, the Integration Service uses the assigned value for the variable during the remainder of the workflow. You must create a variable before you can assign values to it. You cannot assign values to predefined workflow variables.