C# GetBytes, WriteBytes and Embedded Statement Error

Question

I have a problem. When I run my program, it comes up with an error, specifically the CS1023 error. I guess it's because I have a declaration inside a statement, but I don't know how else to write the code. Sometimes C# annoys me, because in C++ I could get away with similar things... anyway, here's the code. I would appreciate it if somebody could explain it to me. Error Message Link

void BtnTotalSeasonsClick(object sender, EventArgs e)
{
    using (var stream = new FileStream(drvFile, FileMode.Open, FileAccess.ReadWrite)) 
    Byte[] bytes = System.Text.ASCIIEncoding.GetBytes(txtTotalSeasons.Text);
    {
        stream.Position = 4;
        Stream.WriteByte(0xCD);
    }
}

Fixed Code with CS0120 error.

        {
using (var stream = new FileStream(drvFile, FileMode.Open, FileAccess.ReadWrite))  
{ 
Byte[] bytes = System.Text.ASCIIEncoding.GetBytes(txtTotalSeasons.Text); 
stream.Position = 4; 
Stream.WriteByte(0xCD); 
} 
    }

Answer 1

There's nothing apparently wrong with the code you pasted in. Perhaps the error is somewhere else above this, and the compiler is getting confused?

Ah, I see you've changed the code.

The problem here is you are declaring the Byte[] array outside the intended using block. Since the scope of the declaration as is is only one line, this constitutes a logic error, and the compiler catches it with a compile-time error.

The compiler is interpreting your code like this:

using (var stream = new FileStream(drvFile, FileMode.Open, FileAccess.ReadWrite))  
{ 
    Byte[] bytes = System.Text.ASCIIEncoding.GetBytes(txtTotalSeasons.Text); 
}

{        
    stream.Position = 4; 
    stream.WriteByte(0xCD); 
}

To fix it, move the Byte[] inside the braces, or outside the using block:

using (var stream = new FileStream(drvFile, FileMode.Open, FileAccess.ReadWrite))  
{ 
    Byte[] bytes = System.Text.ASCIIEncoding.GetBytes(txtTotalSeasons.Text); 
    stream.Position = 4; 
    stream.WriteByte(0xCD); 
} 

-or-

Byte[] bytes = System.Text.ASCIIEncoding.GetBytes(txtTotalSeasons.Text); 

using (var stream = new FileStream(drvFile, FileMode.Open, FileAccess.ReadWrite))  
{ 
    stream.Position = 4; 
    stream.WriteByte(0xCD); 
} 

Personally, I like being annoyed by the compiler here, since it saves me from a run-time error.