Member Avatar for sganandhsg

Hi All,

I am using grid with image column. When user's click image to opened up image(jpg,jpeg,bmp,gif) via a image and fax viewer (i.e by the operating system). i have try to open but it's open in IE any one please me.

Thanks
Anandh

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: the browser decides how image MIME types are handled, so a web page cannot directly launch the OS Image and Fax Viewer. The reliable workaround is to make the browser treat the file as a download (so the user gets an Open/Save dialog). If the user chooses Open, the OS will hand the file to the default image viewer.

Implement a server-side "download" endpoint that streams the image with a Content-Disposition: attachment header. Call that endpoint from your grid click (for example: DownloadImage.ashx?id=123). Important: validate the id, map it to a safe path, and never expose arbitrary file paths.

Example VB.NET IHttpHandler (minimal):

Imports System.IO
Imports System.Web

Public Class DownloadImage
    Implements IHttpHandler

    Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim id As String = context.Request.QueryString("id")
        Dim filePath As String = MapIdToPath(id) ' validate and map securely
        If Not File.Exists(filePath) Then
            context.Response.StatusCode = 404
            Return
        End If
        Dim fileName As String = Path.GetFileName(filePath)
        context.Response.Clear()
        context.Response.ContentType = "application/octet-stream"
        context.Response.AddHeader("Content-Disposition", "attachment; filename=""" & fileName & """")
        context.Response.TransmitFile(filePath)
        context.Response.End()
    End Sub

    Public ReadOnly Property IsReusable() As Boolean Implements IHttpHandler.IsReusable
        Get
            Return False
        End Get
    End Property
End Class

Notes and troubleshooting:

  • Use application/octet-stream or attachment to force a download; serving as image/jpeg will render inline.
  • Some browsers or user settings may still preview files or silently open them — that behavior is ultimately controlled by the client.
  • For large files TransmitFile is preferable to WriteFile for performance.
  • See the HTTP header behavior for Content-Disposition (MDN) and the ASP.NET TransmitFile API (Microsoft).

This approach avoids relying on right-click client changes (as mentioned) and works when grid right-click is disabled.

Recommended Answers

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Member Avatar for catherine sea

Try right-click a JPG file in Windows Explorer, click Open With->Choose default program, set a image or fax viewer you prefer to see if it works.

Member Avatar for sganandhsg

Thanks for your reply, In the grid right-click option is disabled. So we need the precessing for when user click the image to open via image and fax viewer.

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