To clear a error . does not contain a static 'Main' method suitable for an entry point

public static byte[] ReadFile(string filePath)
{
    byte[] buffer;
    FileStream fileStream = new FileStream(@"c:\as.txt", FileMode.Open, FileAccess.Read);
    try
    {
        int length = (int)fileStream.Length;  // get file length
        buffer = new byte[length];            // create buffer
        int count;                            // actual number of bytes read
        int sum = 0;                          // total number of bytes read

        // read until Read method returns 0 (end of the stream has been reached)
        while ((count = fileStream.Read(buffer, sum, length - sum)) > 0)
            sum += count;  // sum is a buffer offset for next reading
    }
    finally
    {
        fileStream.Close();
    }
    return buffer;
}