Searching particular files in the folder - asp.net

Question

Hi I can search all the images with .jpg extension and pass it to the fancybox gallery , The issue is i just want the images of particular productid
for instance if a product has 5 images , and they are saved as (productid_imagenumber.jpg) , therefore a product with productid 99 will be saved as 99_1.jpg , 99_2.jpg similarly 99_5.jpg,
I can pass the productID but i cant find a away just to get the images of that productID , instead of getting all the images which is done by the function below:
Dim directory As DirectoryInfo = New System.IO.DirectoryInfo("C:Images\")
Dim allImages() = directory.GetFiles("*.jpg", SearchOption.AllDirectories)
Dim strContent As String = ""
For Each image As FileInfo In allImages
Dim strTemp As String = (String.Format("<img src=""{0}"" />", image.Name))
strContent = "<a class=""fancybox-thumb"" rel=""fancybox-thumb1"" href=""" & image.Name + image.Extension & """ title="""">" & _
"<img src=""" & image.Name + image.Extension & """ alt="" /></a>"
Next
If Not String.IsNullOrEmpty(strContent) Then
Return String.Format("<div id=""product-lightbox""><p>{0}</p></div>", strContent)
Else
Return String.Empty
End If
End Function
Can any one give any suggestion or assistance on how to do this.

Answer 1

Try this:
Dim images = (From img In directory.GetFiles("*.jpg", IO.SearchOption.AllDirectories)
Where img.Name.Contains("_") _
AndAlso img.Name.Split("_"c)(0) = productID).ToList
Ok, you are using .NET 2.0:
Dim allProductIDImages As New List(Of IO.FileInfo)
For Each img As IO.FileInfo In directory.GetFiles("*.jpg", IO.SearchOption.AllDirectories)
If img.Name.Contains("_") Then
Dim ID As String = img.Name.Split("_"c)(0)
If ID.Equals(productID) Then
allProductIDImages.Add(img)
End If
End If
Next
Another - possibly faster - approach is to let GetFiles pre-search:
Dim pattern As String = String.Format("*{0}_*.jpg", productID)
Dim allProductIDImages() As IO.FileInfo = _
directory.GetFiles(pattern, IO.SearchOption.AllDirectories)