How Do I Access The Value Of A Stored Proc Return Param In C# Using ExecuteNonQuery?

I've got a stored proc to insert a record and return the id of the record inserted in an output param.
How do I access this value in my code after the proc is executed?

param = comm.CreateParameter();
param.ParameterName = "@MemberID";
param.Direction = ParameterDirection.Output;
param.DbType = DbType.Int32;
comm.Parameters.Add(param);

try
{
     rowsAffected = GenericDataAccess.ExecuteNonQuery(comm);
}
catch
{
     rowsAffected = -1;
}