I get an 'object instance' exception

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In the following code I get an exception like 'Use the new keyword to create an object instance' at line 'int fileLength1 = PhotoUpload.PostedFile.ContentLength'. How to solve
it?

C#

string fileName = ImagePreview.ImageUrl;
      int fileLength1 = PhotoUpload.PostedFile.ContentLength;
      byte[] imageBytes = new byte[fileLength1];
      PhotoUpload.PostedFile.InputStream.Read(imageBytes, 0, fileLength1);

Posted 11-Nov-14 4:59am

S.Rajendran from Coimbatore

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Dominic Burford 11-Nov-14 11:08am

Check if the object references for PostedFile and ContentLength both exist before you reference them.

3 solutions

Solution 1

From just that fragment, we can't really tell.
So you need to start by looking at what's going on with the debugger.
Put a breakpoint at the start of the method and step through looking at the various variables. The chances are that either PhotoUpload is null, or it's PostedFile property is. Why they are will depend on your code elsewhere, which we don;t have access to. But when you know which, you can start looking at where it should be set, and that should tell you about why it hasn't been.

Sorry, but without having your code running in your system and doing exactly what you did to get that far there really isn't anything else we can do.

Posted 11-Nov-14 5:06am

OriginalGriff

Solution 3

Check if the object references for PostedFile and ContentLength both exist before you reference them.

Posted 11-Nov-14 5:11am

Dominic Burford

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Tomas Takac · Accepted Answer · 2014-11-11T05:09:00

My guess is there is no file. You need to check if a file was uploaded, only then access the PostedFile property. Modify your code like this:

C#

if(PhotoUpload.HasFile)     
{
      int fileLength1 = PhotoUpload.PostedFile.ContentLength;
      byte[] imageBytes = new byte[fileLength1];
      PhotoUpload.PostedFile.InputStream.Read(imageBytes, 0, fileLength1);
}