How exactly to write a float to a binary file?

Question

C++ / C#

Greetings. I encountered an unpleasant bug when I record a float at an address in someone else's exe / dll. I look at the result with a hex editor, the value of the numbers after the decimal point and their number are different.
For example, I set the number to patch = 2.01276 and it is patched to 2.0127599239e + 0
I do this

void Patch(string file_path, string tp, string val, long addr) {
 BinaryWriter bw = new BinaryWriter(File.Open(file_path, FileMode.Open, FileAccess.ReadWrite));

 bw.BaseStream.Seek(addr, SeekOrigin.Begin);
               
 bw.Write(Convert.ToSingle(val.Replace('.', ',')));
bw.Close();
}

I need the float patched in the file to be exactly the same as I pass it to the program, help.

Answer 1

We BinaryWriterhave a method Write(float arg), and we don't need to convert anything to a string.

Answer 2

Have you tried BitConverter?
Remarks
The order of bytes in the array returned by the GetBytes method depends on whether the computer architecture of the elements is or little endian.