Read query string parameter value in SSRS Report

Question

I have passed one parameter to report server url.

http://<your server>/ReportServer?/<folder>/<reportname>&UserID=Name

How can I read UserID value in report.

Or

How can I print this value in any of the textbox to check what is passed to it?
For example: Above url should show 'Name'.

Answer 1

Issue was with my parameter UserId.

I have set it as Internal that's why it was set to default value blank space instead of passed parameter UserId value. (Now I am using hidden)

Note: Report parameters are case sensitive so in my case it must be UserId