Know its not that efficient to have all the operations insertion updation and deletion in a single stored procedure. But 
here u go. 

Single Stored Procedure for insert update and delete

USE [CommunityPortal]
GO
/****** Object:  StoredProcedure [dbo].[usp_MasterInsertUpdateDelete]    Script Date: 09/22/2011 06:08:42 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:		
-- Create date: 
-- Description:	
-- =============================================
ALTER PROCEDURE [dbo].[usp_MasterInsertUpdateDelete] 
	-- Add the parameters for the stored procedure here
	@StatementType nvarchar(20) = "Insert"
AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
	SET NOCOUNT ON;

	IF @StatementType = 'Insert'
	BEGIN
		SELECT * FROM City ' Replace with Insert Code
	END ELSE IF @StatementType = 'Update' 
	BEGIN
		SELECT * FROM State ' Replace wwith Update Code
	END ELSE IF @StatementType = 'Delete'
	BEGIN
		SELECT * FROM Country	' Replace with delete code
	END
END