As Joel mentioned you should use an HttpHandler or a page to display the image. Here is a sample code to output image (Image.ashx) :
// ProcessRequest method of Image.ashx
long imageId = Convert.ToInt64(Request.QueryString["ImageId"]);
using (var conn = new SqlConnection(connectionString))
using (var command = new SqlCommand(
"SELECT ImageFile FROM ImageTable WHERE ImageId = @ImageID", conn))
{
command.Parameters.Add("@ImageID", SqlDbType.Int).Value = imageId;
conn.Open();
Response.ContentType = "image/gif";
Response.BinaryWrite((byte[]) command.ExecuteScalar());
}
and then use image in your page as :
<asp:Image id="Image1" runat="server" ImageUrl="Image.ashx?ImageID=12"/>
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