Convert varbinary to string C#

How to convert varbinary to string c#?

//convert varbinary to string c#

public byte[] binaryData { get; set; }

//FOR ASCII Encoding
string ascii = System.Text.Encoding.ASCII.GetString(binaryData);

OR

//FOR UTF8 Encoding
string utf = System.Text.Encoding.UTF8.GetString(binaryData);

OR

//FOR Unicode Encoding
string unicode = System.Text.Encoding.Unicode.GetString(binaryData);

OR

//CONVERT BYTE ARRAY TO HEXA
string AsString = SecurityManager.ByteToHexBitFiddle(binaryData);

//CONVERT BYTE ARRAY TO HEXA
public static string ByteToHexString(byte[] bytes)
{
    char[] c = new char[bytes.Length * 2];
    int b;
    for (int i = 0; i < bytes.Length; i++) { 
        b = bytes[i] >> 4;
        c[i * 2] = (char)(55 + b + (((b-10)>>31)&-7));
        b = bytes[i] & 0xF;
        c[i * 2 + 1] = (char)(55 + b + (((b-10)>>31)&-7));
    }
    return new string(c);
}