stored procedure not working when calling from wcf service

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SQL

WCFServices

entity-framework

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i have a stored procedure it will basically insert and update based on a string passed as parameter to sp, sp works fine if it is executed in SSMS, but if i invoke the same sp from SL5 application using WCF Service it returns the saved information which i pass from the sp, but if i query the table insert thru sp, it takes time to list 10 records with 3 columns, while it taking time i queried using sp_who2 which show the select statement is blocked a SPID, which was the one from SL5 Application, How to resolve this and insert / Update freom UI