I want to create where clause from dynamic linq query

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LINQ

I got below Functions for where clause

public static IQueryable<T> Where<T>(this IQueryable<T> source, string predicate, params object[] values)
       {
           return (IQueryable<T>)Where((IQueryable)source, predicate, values);
       }

       public static IQueryable Where(this IQueryable source, string predicate, params object[] values) {
           if (source == null) throw new ArgumentNullException("source");
           if (predicate == null) throw new ArgumentNullException("predicate");
           LambdaExpression lambda = DynamicExpression.ParseLambda(source.ElementType, typeof(bool), predicate, values);
           return source.Provider.CreateQuery(
               Expression.Call(
                   typeof(Queryable), "Where",
                   new Type[] { source.ElementType },
                   source.Expression, Expression.Quote(lambda)));
       }

But how to call this functions from specific type ...

public static IQueryable<mytable> Where<mytable>(this IQueryable<mytable> source, string predicate, params object[] values)

please any one help me..