SSRS: how to use custom ids instead of index values in multi-value parameters?

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C#

reporting-services

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I'm trying to pass the custom Id in multivalue parameter.Basically by defualt multivalue parameter accepts only index like 0,1 and its return data on base of that index but my current SSRS requirement that to use the custom ID in multivalue paramter.

What I have tried:

This is the default expression of mulitvalue paramter to get value of lable.

= Parameters!multivalue.Label(0)

I tried this, but it doesn't work:

= Parameters!multivalue.Label(textId)