Database

private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                SqlConnection cn = new SqlConnection("initial catalog=vvvvvvvvvvv;server=.;integrated security=sspi");
                SqlCommand cmd = new SqlCommand("back_up_database", cn);
                cmd.CommandType = CommandType.StoredProcedure;

                cn.Open();

                int i = cmd.ExecuteNonQuery();

                cn.Close();



                if (i > 0)
                {
                    MessageBox.Show("Your database is backed up");
                }
            }
            catch(Exception ex)
            {
                MessageBox.Show("Sorry we can not back up your database");
            }
        }

ALTER proc [dbo].[back_up_database]
as
ALTER DATABASE [vvvvvvvvvvv]
SET OFFLINE
go
BACKUP DATABASE [vvvvvvvvvvv]
TO DISK = 'D:\SQLServerBackups\vvvvvvvvvvv.Bak'
with NO_COMPRESSION
go
ALTER DATABASE [vvvvvvvvvvv]
SET ONLINE
go

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- ==========================================================================================================
-- Author:	Priyamtheone
-- Create date: 2009-Oct-08
-- Description:	This procedure is used to create a login, create an user in TestDB database associated to
--		that login and assign the role 'db_generaluser' to that user. The login name and password
--		will be supplied from externally through input parameters. If this procedure executes
--		successfully it returns 0 else 1 to the caller through an output parameter.
-- ==========================================================================================================
CREATE PROCEDURE [dbo].[sp_CreateLogin] 
	-- Add the parameters for the stored procedure here.
	@loginname sysname,
	@passwd	sysname,
	@intRetVal int = 0 output	--Output parameter.
AS
BEGIN
	-- SET NOCOUNT ON added to prevent extra result sets from interfering with SELECT statements.
	SET NOCOUNT ON;
	SET @intRetVal = 0;

	BEGIN TRY
		CREATE LOGIN @loginname WITH PASSWORD=@passwd, DEFAULT_DATABASE=[TestDB], DEFAULT_LANGUAGE=[us_english], CHECK_EXPIRATION=OFF, CHECK_POLICY=OFF

		CREATE USER @loginname FOR LOGIN @loginname WITH DEFAULT_SCHEMA=[dbo]

		EXEC sp_addrolemember N'db_generaluser', @loginname
	END TRY
	BEGIN CATCH
		SET @intRetVal = 1;	--Something went wrong. So set the return value to 1.
	END CATCH
END
GO

select itemname,rate,qty,discount,(rate * qty) as amount,(amount -(amount * (disount/100))) as Total from ItemMaster;

select itemname,rate,qty,discount,(rate * qty) as amount,((rate * qty) - ((rate * qty) * (disount/100))) as Total from ItemMaster;