How to delete Session from Database using C# in ASP.Net

hi

I use below code to save session in database:

<sessionState        mode="SQLServer" allowCustomSqlDatabase="true"        timeout="1440" sqlConnectionString="Data Source=.;Initial Catalog=ASPState;User ID=sa;Password=2008"/>

now I want when users click on  button it delete user's session from database

below are table code in database:

USE [ASPState]
GO

/****** Object:  Table [dbo].[ASPStateTempApplications]    Script Date: 12/22/2016 21:56:53 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[ASPStateTempApplications](
	[AppId] [int] NOT NULL,
	[AppName] [char](280) NOT NULL,
PRIMARY KEY CLUSTERED 
(
	[AppId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

AND:

USE [ASPState]
GO

/****** Object:  Table [dbo].[ASPStateTempSessions]    Script Date: 12/22/2016 21:57:13 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[ASPStateTempSessions](
	[SessionId] [nvarchar](88) NOT NULL,
	[Created] [datetime] NOT NULL,
	[Expires] [datetime] NOT NULL,
	[LockDate] [datetime] NOT NULL,
	[LockDateLocal] [datetime] NOT NULL,
	[LockCookie] [int] NOT NULL,
	[Timeout] [int] NOT NULL,
	[Locked] [bit] NOT NULL,
	[SessionItemShort] [varbinary](7000) NULL,
	[SessionItemLong] [image] NULL,
	[Flags] [int] NOT NULL,
PRIMARY KEY CLUSTERED 
(
	[SessionId] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]

GO

SET ANSI_PADDING OFF
GO

ALTER TABLE [dbo].[ASPStateTempSessions] ADD  DEFAULT (getutcdate()) FOR [Created]
GO

ALTER TABLE [dbo].[ASPStateTempSessions] ADD  DEFAULT ((0)) FOR [Flags]
GO

How I can delete session from these table?

Best regards

neda