Hi fatihlinux,

Here i have created sample that full fill your requirement. You need to change as per your data saved in the database.

I have created the sample refering the below article.

Displaying images that are stored outside the Website Root Folder

SQL

CREATE TABLE Files(Id INT IDENTITY PRIMARY KEY,Name VARCHAR(500),FilePath VARCHAR(1000))
INSERT INTO Files VALUES('Chrysanthemum.jpg','C:\Users\Public\Pictures\Sample Pictures')
INSERT INTO Files VALUES('Desert.jpg','C:\Users\Public\Pictures\Sample Pictures')
INSERT INTO Files VALUES('Hydrangeas.jpg','C:\Users\Public\Pictures\Sample Pictures')
INSERT INTO Files VALUES('Jellyfish.jpg','C:\Users\Public\Pictures\Sample Pictures')
SELECT * FROM Files

HTML

Default.aspx

<div>
    <asp:GridView ID="GridView2" runat="server" AutoGenerateColumns="False">
        <Columns>
            <asp:BoundField DataField="Name" HeaderText="Name" />
            <asp:TemplateField HeaderText="Photo">
                <ItemTemplate>
                    <asp:Image ImageUrl='<%# String.Format("ImageCSharp.aspx?FileName={0}&FilePath={1}", Eval("Name"),Eval("FilePath")) %>'
                        runat="server" Height="50px" Width="50px" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </asp:GridView>
</div>

Code

Default.aspx

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
        using (SqlConnection con = new SqlConnection(constr))
        {
            using (SqlCommand cmd = new SqlCommand("SELECT * FROM Files"))
            {
                using (SqlDataAdapter sda = new SqlDataAdapter())
                {
                    cmd.Connection = con;
                    sda.SelectCommand = cmd;
                    using (DataTable dt = new DataTable())
                    {
                        sda.Fill(dt);
                        GridView2.DataSource = dt;
                        GridView2.DataBind();
                    }
                }
            }
        }
    }
}

ImageCSharp.aspx

protected void Page_Load(object sender, EventArgs e)
{
    if (Request.QueryString["FileName"] != null && Request.QueryString["FilePath"] != null)
    {
        string filePath = Request.QueryString["FilePath"];
        string filename = Request.QueryString["FileName"];
        string contenttype = "image/" + Path.GetExtension(filename.Replace(".", ""));
        FileStream fs = new FileStream(filePath + "\\" + filename, FileMode.Open, FileAccess.Read);
        BinaryReader br = new BinaryReader(fs);
        Byte[] bytes = br.ReadBytes((Int32)fs.Length);
        br.Close();
        fs.Close();
        Response.Buffer = true;
        Response.Charset = "";
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.ContentType = contenttype;
        Response.AddHeader("content-disposition", "attachment;filename=" + filename);
        Response.BinaryWrite(bytes);
        Response.Flush();
        Response.End();
    }
}

Screenshot