DbMigration: How to use IF EXISTS in SQL()

Please I have a web App with lots of migrations. I need to drop an index first if it exist before creating it. In the Dbmigration method. I used DropIndex("[Log]", "[IX_ContentL]") But it throws error, the specified index does not exist. So I tried to first check if the index exist or not using Sql(" IF EXISTS(SELECT * FROM sys.indexes WHERE name=[IX_ContentL] AND object_Id = [dbo].[Log]) DROP INDEX ([IX_ContentL]);"); But it throws an unable to parse statement error with the following information. [Token Line 1, Token offset 1, Token error IF] Please help me, I've been on this 3 days now. I've tried different combination as suggested on different blogs. It seems the Sql() function does not recognize the IF EXISTS statement. Please I need help. Thanks.