passing parameter in mdx query - reporting-services

Question

What I am trying to do is; User would select value of region from the dropdown(Region1, Region2, Region3).
#Region should take that value in the mdx query.
for eg. if user selects Region2, it should look like: [Region].[Region2].children. The query that I have written shows that there's a syntax error.
WITH
MEMBER [measures].[region] AS
StrToMember("[Region].[" + #Region + "]").CurrentMember.Name
MEMBER [measures].[product] AS
[Product Line].[product Line L2].CurrentMember.Name
SELECT
NonEmpty
(
StrToMember("[Region].[" + #Region + "]").Children
*
[Product Line].[Product Line L2].Children
,[Measures].[Total Clients]
) ON ROWS
,{
[measures].[region]
,[measures].[product]
,[Measures].[Total Clients]
} ON COLUMNS
FROM [EQ Coverage];

Answer 1

You also have available the function strToSet so this:
StrToMember("[Region].[" + #Region + "]").Children
Could be written as:
StrToSet("[Region].[" + #Region + "].Children", CONSTRAINED)
BUT I'm unsure of the purpose of this part of your code?
MEMBER [measures].[region] AS
StrToMember("[Region].[" + #Region + "]").CurrentMember.Name
I don't see the purpose of using the parameter - you could do something like this?
MEMBER [measures].[region] AS
[Region].[Region].CurrentMember.member_caption