Getting results from sqldatasource in codebehind

(New to ASP.net 2.0 and database connection)

I have created an sqldatasource on the aspx page, which works fine, but how do I get the results from it in the codebehind?

hmm..you should create the datasource in the code behind page. I mean that's what the page is for. Place all your asp.net code in it. If you use a code-behind page then aspx page is just for displaying the data.
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I can't seem to get it working. The connection works fine (I believe), but I can't seem to give the parameters a value

I have this code: (I know it's Insert instead of select, but that's what I'm working on now)

SqlDataSourceSupplierList.InsertCommand ="INSERT INTO dbo.ProdSup(SupID, ProdID) VALUES (@.SupID, @.ProdID)";

SqlDataSourceSupplierList.InsertParameters.Add("@.SupID", SqlDbType.Int) = 4;

SqlDataSourceSupplierList.InsertParameters.Add("@.ProdID","8");

SqlDataSourceSupplierList.Insert();

As you can see I have tried two ways to give them values, but none of them works. The fields in the DB are both integer, which I guess is why the second try doesn't work (it sends '8' in as a string)... The error I get here is that it "cannot insert the value NULL into column"

The line with @.SupID gives me this error:

CS1502: The best overloaded method match for 'System.Web.UI.WebControls.ParameterCollection.Add(string, string)' has some invalid arguments

What's wrong here?