File Access Permission

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MS-Access

security

file

Hi,

I am trying to open a standard text file that I have created in a directory within the project solution directory and I get an UnauthorizedAccessException. The application is set to be a full-trust application. I am accessing the file by its full path, including the drive letter), and the exception is being generated in the constructor of a StreamReader. The permissions on the folder are inherited from the root drive and Owner/Creator has full read/write permission.

I know I should read the complete ins-and-outs of .NET security, but this is a quick-and-dirty test application and I am on a very tight deadline. I am hoping I am doing something obvious wrong.

Any ideas very gratefully received.

Best wishes, Patrick

The code is as follows:

private void buttonDrawGraph_Click( object sender, EventArgs e )
{
	char[] splitCharacter = new char[] { ',' };
	try
	{
		using ( StreamReader textFileReader = new StreamReader( @"D:\Dev\Projects\DLP\DLP\data" ) )
		{
			while ( ( string oneLine = textFileReader.ReadLine() ) != null ) 
					{
					}
		}
	}
	catch ( System.IO.FileNotFoundException ) 
	{
		MessageBox.Show( "Could not open file '" + textBoxDataFile.Text + "'" );
	}
}

The line where the StreamReader is created causes the exception.