Generic awesomeness in C#

gistfile1.cs

public void Add<TEntity>(TEntity t) where TEntity : class
{
    var properties = (from p in GetType().GetProperties()
                              select p.GetGetMethod(true));
    var genericProperties = (from property in GetType().GetProperties()
                                     let returntype = property.GetGetMethod(true).ReturnType
                                     where returntype.IsGenericType
                                     where returntype.GetGenericArguments().Length == 1
                                     let argumenttype = returntype.GetGenericArguments().First()
                                     where argumenttype == typeof (TEntity)
                                     select property).ToList();
    if (genericProperties.Count() == 0)
                throw new RepositoryException("Zero DbSets found matching type: " + typeof(TEntity));
    if(genericProperties.Count() > 1)
                throw new RepositoryException("More than one DbSet of type: " + typeof(TEntity));
    return genericProperties.First().GetGetMethod(true).Invoke(this, null);


    var dbSetProperty = genericProperties.First();

    try
    {
	var dbSet = dbSetProperty.GetGetMethod(true).Invoke(this, null);
	dbSet.GetType().InvokeMember("Add", BindingFlags.Public, null, dbSet, new object[] {t});
    }
    catch (TargetInvocationException e)
    {
	throw e.InnerException;
    }
}