C # Implementation of decimal number conversion to binary, octal, hexadecimal number algorithm

Using System;   
Using System.Collections.Generic;   
Using System.ComponentModel;   
Using System.Data;   
Using System.Drawing;   
Using System.Text;   
  
Using System.Windows.Forms;   
            namespace Exdtob {public partial class Form1:form {public Form1 () {   
        InitializeComponent ();   
            //Decimal Turn two public string Dtob (int d) {string b = "";   
            To determine if the number is less than 2, direct output if (D < 2) {b = d.tostring ();   
                else {int C;   
                int s = 0;   
                int n = d;   
                    while (n >= 2) {s++;   
                n = N/2;   
                } int[] m = new Int[s];   
                int i = 0;   do {c = D/2;
                    m[i++] = d% 2;   
                D = C;   
                while (c >= 2);   
                b = d.tostring (); for (int j = m.length-1 J >=0; j--) {b + = M[j].   
                ToString ();   
        } return B;   
            }//Decimal octal---www.bianceng.cn public string dtoo (int d) {string o = "";   
            if (D < 8) {o = d.tostring ();   
                   
                else {int C;   
                int s=0;   
                int N=d;   
                int temp = D;   
                    while (n >= 8) {s++;   
                n = n/8;   
                } int[] m = new Int[s];   
                int i = 0;   
     do {               c = D/8;   
                    m[i++] = d% 8;   
                D = C;   
                while (c >= 8);   
                o = d.tostring ();   
                for (int j = m.length-1 J >= 0; j--) {o = = M[j];   
        } return o;   
            }//decimal hexadecimal public string Dtox (int d) {string x = "";   
            if (d <) {x = Chang (d);   
                else {int C;   
                int s = 0;   
                int n = d;   
                int temp = D;   
                    while (n >=) {s++;   
                n = n/16;   
                } string [] m = new String[s];   
                int i = 0;   
            do {        c = D/16;   
                m[i++] = Chang (d% 16),//judge whether is greater than 10, if greater than 10, then convert to a~f format d = c;   
                while (c >= 16);   
                x = Chang (d);   
                for (int j = m.length-1 J >= 0; j--) {x = = M[j];   
        } return x; //Determine if the number is between 10~15 and if yes convert public string chang (int d) {string x =   
            "";   
                    Switch (d) {case 10:x = "A";   
                Break   
                    Case 11:x = "B";   
                Break   
                    Case 12:x = "C";   
                Break   
                    Case 13:x = "D";   
                Break   
                  Case 14:x = "E";  Break   
                    Case 15:x = "F";   
                Break   
                    default:x = D.tostring ();   
            Break   
        return x; } private void Button1_Click (object sender, EventArgs e) {TextBox2.Text = Dtob (Co Nvert.   
        ToInt32 (TextBox1.Text));//10 conversion binary} private void Button2_Click (object sender, EventArgs e) {TextBox2.Text = Dtoo (Convert.ToInt32 (TextBox1.Text));//10 ext octal} private void B Utton3_click (object sender, EventArgs e) {TextBox2.Text = Dtox (Convert.ToInt32 (TextBox1.Text)); Decimal Hexadecimal}}}