I've a package variable "varmodby" which is a string datatype and value =Update_Table_name
that I want to feed into a stored procedure without directly assiging the value to storedprocedure.

Below is storedprocedure 

declare @p_PCount int,
@p_FCount int

Exec [dbo].[usp_Process]'Update_Table_name',1,
@p_PCount output,
@p_FCount output
select @p_PCount, @p_FCount


Please help.

Exec [dbo].[usp_Process] ?,1,
? output,
? output