Catch StreamWriter Exception

Stream writer is used to write characters to a stream in a particular encoding. By default, a StreamWriter is not thread safe and use an instance of UTF8Encoding. You can specify it if you want to.

Example

string fileName = @"c:\text.txt";

try
{
    using (FileStream fs = new FileStream(fileName, FileMode.CreateNew))
    {
        StreamWriter sw = new StreamWriter(fs, Encoding.Unicode);
        sw.WriteLine("Hello world");
        sw.Close();
        fs.Close();
    }
}
catch (IOException)
{
    MessageBox.Show("No enough disk space or drive is readonly");
}
catch (UnauthorizedAccessException)
{
    MessageBox.Show("Access deny");
}
catch (SecurityException)
{
    MessageBox.Show("You don't have enough required permission");
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}

There are more exception you should use when you using StreamWriter

Exception Type	Condition
IOException	A general I/O exception occurred, such as trying to access a CD-ROM drive whose tray is open.
DirectoryNotFoundException	The directory information specified in path was not found.
UnauthorizedAccessException	Access is denied. The caller does not have the required permission.
ArgumentException	path is a zero-length string, contains only white space, or contains one or more implementation-specific invalid characters.
ArgumentNullException	path or encoding is null
NotSupportedException	path is in an implementation-specific invalid format.
PathTooLongException	The length of path or the absolute path information for path exceeds the implementation-specific maximum length.
SecurityException	The caller does not have the required permission.