working around with reportviewer

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C#

reporting

hello guys... i would like to ask if anyone can help me with my problem... you see i have created a reportviewer that has its datasource on an xml file... now the problem is i want to put a dynamic content based from another table that is not related to the table on my datasource(my xml file)...
assuming i have an xml file with table named table_user and i have another table named not_related_table now i want to display the content of [not_related_table] and the content of [table_user] in one rdlc file...
but the problem is it seems that i can only use 1 dataset/datasource... when i try to connect to a second dataset that contains the content of [not_related_table] it gives an error that says cannot find the column/field of the not_related_table...

Basically i just want to display both the content of [not_related_table] and the content of [table_user] in one rdlc... how to do this? if possible can you provide me with the code for that or the step by step on how to achieved this?by the way the datasource [table_user] is an xml file,

i was thinking of just passing a parameter and this parameter are the contents of [not_related_table]... i tried passing a parameter but it just returns an empty string