How to retrieve image form folder against specific id in gridview

below is code

            string[] filePaths = Directory.GetFiles(Server.MapPath("~/Images/"));
            List<ListItem> files = new List<ListItem>();
            foreach (string filePath in filePaths)
            {
                string fileName = Path.GetFileName(filePath);
                files.Add(new ListItem(fileName, "~/Images/" + fileName));
            }
            GridView1.DataSource = files;
            GridView1.DataBind();

Now i want to retrieve data against specific id 

CREATE TABLE [dbo].[tbl_Contdetail](
	[Con_ID] [int] IDENTITY(1,1) NOT NULL,
	[ContNo] [varchar](50) NULL,
	[DID] [int] NULL,
	[Con_Date] [date] NULL,
	[PicPath] [varchar](200) NULL,
	[PicName] [varchar](50) NULL,
 CONSTRAINT [PK_tbl_Contdetail] PRIMARY KEY CLUSTERED 
(
	[Con_ID] ASC
)WITH (PAD_INDEX  = OFF, STATISTICS_NORECOMPUTE  = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS  = ON, ALLOW_PAGE_LOCKS  = ON) ON [PRIMARY]
) ON [PRIMARY]

i will call image from DID