urgent! please help me!

public int BinToInt(string binaryNumber)

  int multiplier = 1;

  int converted = 0;

  for (int i = binaryNumber.Length - 1; i >= 0; i--)

    int t = System.Convert.ToInt16(binaryNumber[i].ToString());

  return converted;
}

In use:

// remember SEFTU, sixteen, eight, four, two, one

  listBox1.Items.Add(BinToInt("00001").ToString()); // 1

  listBox1.Items.Add(BinToInt("00010").ToString()); // 2

  listBox1.Items.Add(BinToInt("00011").ToString()); // 3

  listBox1.Items.Add(BinToInt("00100").ToString()); // 4

  listBox1.Items.Add(BinToInt("00101").ToString()); // 5

  listBox1.Items.Add(BinToInt("00111").ToString()); // 7

  listBox1.Items.Add(BinToInt("01000").ToString()); // 8

  listBox1.Items.Add(BinToInt("10000").ToString()); // 16

Provided as-is.

More about binary can be found here:
http://en.wikipedia.org/wiki/Binary_numeral_system

HTH