Separate Dropdown List Selectedvalue Into Two Fields

i have two columns in a "release" table that i concatenate on my aspx page into one value for my dropdown list.  for example, my database columns might look like

Major: 3 | 3 | 4 | 4 | 5
Minor: 1 | 2 | 1 | 2 | 1

and my drop down list text like
3.1 | 3.2 | 4.1 | 4.2 | 5.1

my question comes when trying to take the drop down list's selected value and splitting it back into two fields so that i can use it for another query.  how can i split my "major" and "minor" version numbers back up so that i can run a query similar to:

SELECT * FROM [Version] WHERE (([Major] = @Major) AND ([Minor] = @Minor))

but only having the one parameter of: <asp:ControlParameter ControlID="ddlVersion" Name="Version" PropertyName="Text" Type="String" /> where the selected value has a string of "<major>.<minor>" (where the numbers are separated by a period)?