Tag Archives: Asp.net Errors

Parameter is not valid. Asp.net GDI exception

I was getting this exception while working with the GDI images in asp.net.
My requirement was to upload the image from client then resize it and display.

The code was working fine on local development machine, but on production server it was throwing “Parameter is not valid” exception.

The general cause of this is that non-availability of resources required to generate a valid image file.

In my case the reason was that the destination folder was having read-only permissions, which was causing the code to hault while saving the processed image back to server.

For the resources I read during this issue, I found out some more reasons, these can be following:
1) Invalid source image path passed to the Drawing/Image/Bitmap object.
2) Invalid destination image path passed to the Drawing/Image/Bitmap object.
3) Corrupted/incomplete byte array.
4) Disposing of Source object before completing generation of new Image.
5) Folder write permissions while saving the new file.

Unable to validate data, ASP.net error

Unable to validate data, ASP.net error at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length, Int32& dataLength) at System.Web.UI.ObjectStateFormatter.Deserialize(String inputString)

This is an View state decoding error.

The basic reason of this is the difference of key while encrypting and decrypting the viewstate data. Suppose an asp.net rendered a page with key1 and saved the page state in view state, meanwhile asp.net’s key is changed to key2, now when some server side event will occur on page the viewstate will get decrypted and this error will occur as the old view state is now not valid due to a different encryption key.

It may occur when you open a page for along time and after that do some events on that.

Fix the key in your web.config file, so that only one key is used to encrypt and decrypt the viewstate data.

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