Pass Parameters to SqlDataSource

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C#3.0

C#

How to pass parameters from the C# application to the Datasourec.I have my stored procedure in My Server.Then i used a datasource and used the stored procedure in the datasource.
My Procedure is:
set ANSI_NULLS ON
set QUOTED_IDENTIFIER ON
go

ALTER PROCEDURE [dbo].[RecordManagement_getcollegeid]
@College nvarchar(max)
AS
Select College_ID
From College
WHERE College_Name = @College

In my application i want to pass a value from the dropdownlist.
Application Code:
SqlDataSource_GetCollegeID.SelectParameters["College"].DefaultValue = ddlistschools.SelectedValue;

I should also be able to stored the value of selected College ID into a variable.

Thanks