Converting bytes[] to VARBINARY is not working

I am trying to save a file into a SQL Server database and the column that the file will be saved in is of datatype VARBINARY.

The way I am currently doing this is by getting the file path and turning the file into a byte array.

string SelectedFilePath = "" ;
OpenFileDialog choofdlog = new OpenFileDialog();

if (choofdlog.ShowDialog() == DialogResult.OK)
{
    SelectedFilePath = choofdlog.FileName;      
}

byte[] Filebytes = File.ReadAllBytes(SelectedFilePath);

Then, I insert the bytes into the database using an insert query and the convert function to convert the byte[] to varbinary:

INSERT * INTO TblFile([FILEID], [FILEDATA])  
VALUES('" + Guid.newGuid + "', CONVERT(VARBINARY, '" + Filebytes + "'));

However, in the SQL Server database, the value of the FILEDATA is always

0x53797374656D2E427974655B5D

And it doesn't matter which file I select the FILEDATA will always be that number. So if you could tell me why this is happening and what I should do to prevent it I would very much appreciate that.