Wanted to do an order by on three or more columns using expression how to do that

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LINQ

expression

trees

I have a List object. I am converting this to IQueryable by calling a method AsQueryable().

I need to do sorting on multiple columns say for ex. four columns say col1, col2 col3 & col4 using the expressing tree only. Any one has ideas, how to do that.

thanks

Any help appriciated...

What I have tried:

List<employee> obj = new List<employee>
query = obj.AsQueryable<employee>()

var paramterExpression = Expression.Parameter(typeof(Employee));

Expression<func><employee> orderByExpression = 
 (Expression<func><employee>)Expression.Lambda(Expression.PropertyOrField(paramterExpression, "EmpName"), paramterExpression);

query.OrderBy(orderByExpression).

the above code is for one column, for the second column some people are saying to use <ode>thenby. beyond that nobody says how to do that.