mo_global.set_policy_context Calling in C# .Net

How to allow the policy to use Oracle Views (Applications) before report (RDLC) in Report Viewer.

Something like this:

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SELECT AMOUNT_APPLICABLE_TO_DISCOUNT From AP_INVOICES_V 

I need to call this PL/SQL Before Using this select statement:

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Begin mo_global.set_policy_context('S', 90); End; 

so I did this on page load before setting the SQL Data source to the report:

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            if (!IsPostBack) {   db.connectODB(); OracleCommand ora_cmd = new OracleCommand("mo_global.set_policy_context", db.con); ora_cmd.BindByName = true; ora_cmd.CommandType = CommandType.StoredProcedure;   ora_cmd.Parameters.Add(