Question

how to code in c# to get the total number of 1's as the numbers are added in a Listbox in windows forms

Answer 1

Answer.

1. namespace test   
2. {   
3. using System;   
4. using System.Drawing;   
5. using System.Collections;   
6. using System.ComponentModel;   
7. using System.Windows.Forms;   
8. using System.Data;   
9. public class ListBox : System.Windows.Forms.Form   
10. {   
11. private System.ComponentModel.Container container;   
12. private System.Windows.Forms.Button buttonAdd;   
13. private System.Windows.Forms.Button buttonClose;   
14. private System.Windows.Forms.Button buttonModify;   
15. private System.Windows.Forms.Button buttonDelete;   
16. private System.Windows.Forms.Button buttonMoveUp;   
17. private System.Windows.Forms.Button buttonMoveDown;   
18. private System.Windows.Forms.ListBox listbox;   
19. private System.Windows.Forms.TextBox textbox;   
20. private System.Windows.Forms.Label label;   
21. private int nSelectedIndex;   
22. //*********SIZE & LOCATION******************//   
23. // COMPONENT - BUTTON(s) aligned along X-axis.   
24. const int BUTTON_LENGTH = 50;   
25. const int BUTTON_HEIGHT = 20;   
26. const int FIRSTBUTTON_XPOS = 20;   
27. const int FIRSTBUTTON_YPOS =220;   
28. const int XSPACING = 70; // (Note: XSPACING >= BUTTON_LENGTH)   
29. const int YSPACING = 0;   
30. //COMPONENT - MOVE BUTTONS   
31. const int MBUTTON_LENGTH = 20;   
32. const int MBUTTON_HEIGHT = 20;   
33. const int FIRSTMBUTTON_XPOS = 220;   
34. const int FIRSTMBUTTON_YPOS =70;   
35. const int SECONDMBUTTON_XPOS = 220;   
36. const int SECONDMBUTTON_YPOS =100;   
37. // COMPONENT - LISTBOX   
38. const int LISTBOX_LENGTH = 3*BUTTON_LENGTH;   
39. const int LISTBOX_HEIGHT = 6*BUTTON_HEIGHT;   
40. const int LISTBOX_XPOS = 50;   
41. const int LISTBOX_YPOS = 50;   
42. // COMPONENT - LABEL   
43. const int LABEL_LENGTH = 50;   
44. const int LABEL_HEIGHT = 50;   
45. const int LABEL_XPOS = 20; // align it with first button   
46. const int LABEL_YPOS = 173;   
47. // COMPONENT - TEXTBOX   
48. const int TEXTBOX_LENGTH = 120;   
49. const int TEXTBOX_HEIGHT = 50;   
50. const int TEXTBOX_XPOS = 70;   
51. const int TEXTBOX_YPOS = 170;   
52. public ListBox() : base()   
53. {   
54. InitializeComponent();   
55. }   
56. public override void Dispose()   
57. {   
58. base.Dispose();   
59. container.Dispose();   
60. }   
61. private void InitializeComponent()   
62. {
63. // this   
64. this.container = new System.ComponentModel.Container();   
65. this.Text="List Box";   
66. // buttonAdd   
67. this.buttonAdd = new System.Windows.Forms.Button();   
68. buttonAdd.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS,FIRSTBUTTON_YPOS);   
69. buttonAdd.Text = "&Add";   
70. buttonAdd.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
71. buttonAdd.Click += new System.EventHandler(this.buttonAdd_Click); buttonAdd.Enabled = false;   
72. this.Controls.Add(this.buttonAdd);   
73. //buttonModify   
74. this.buttonModify = new System.Windows.Forms.Button();   
75. buttonModify.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS+XSPACING,FIRSTBUTTON_YPOS+YSPACING);   
76. buttonModify.Text = "&Modify";   
77. buttonModify.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
78. buttonModify.Click += new System.EventHandler(this.buttonModify_Click); buttonModify.Enabled = false;   
79. this.Controls.Add(this.buttonModify);   
80. //buttonDelete   
81. this.buttonDelete = new System.Windows.Forms.Button();   
82. buttonDelete.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS+2*XSPACING,FIRSTBUTTON_YPOS+2*YSPACING); buttonDelete.Text = "&Delete";   
83. buttonDelete.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
84. buttonDelete.Enabled = false;   
85. buttonDelete.Click += new System.EventHandler(this.buttonDelete_Click);   
86. this.Controls.Add(this.buttonDelete);   
87. // buttonClose   
88. this.buttonClose = new System.Windows.Forms.Button();   
89. buttonClose.Location = new System.Drawing.Point(FIRSTBUTTON_XPOS+3*XSPACING,FIRSTBUTTON_YPOS+3*YSPACING); buttonClose.Text = "&Close";   
90. buttonClose.Size = new System.Drawing.Size(BUTTON_LENGTH,BUTTON_HEIGHT);   
91. buttonClose.Click += new System.EventHandler(this.buttonClose_Click);   
92. this.Controls.Add(this.buttonClose);   
93. // listbox   
94. this.listbox = new System.Windows.Forms.ListBox();   
95. listbox.Location = new System.Drawing.Point(LISTBOX_XPOS,LISTBOX_YPOS);   
96. listbox.Size = new System.Drawing.Size(LISTBOX_LENGTH,LISTBOX_HEIGHT);   
97. listbox.Click += new System.EventHandler(this.listbox_SelectedIndexChanged);   
98. listbox.BackColor = (Color)System.Drawing.SystemColors.Desktop;   
99. this.Controls.Add(this.listbox);   
100. // label   
101. this.label = new System.Windows.Forms.Label();   
102. label.Location = new System.Drawing.Point(LABEL_XPOS,LABEL_YPOS);   
103. label.Size = new System.Drawing.Size(LABEL_LENGTH,LABEL_HEIGHT);   
104. label.Text = "Enter:";   
105. this.Controls.Add(this.label);   
106. // textbox   
107. this.textbox = new System.Windows.Forms.TextBox();   
108. textbox.Location = new System.Drawing.Point(TEXTBOX_XPOS,TEXTBOX_YPOS); textbox.Click += new System.EventHandler(this.textbox_Click);   
109. textbox.Size = new System.Drawing.Size(TEXTBOX_LENGTH,TEXTBOX_HEIGHT);   
110. this.Controls.Add(this.textbox);   
111. // buttonMoveUp   
112. this.buttonMoveUp = new System.Windows.Forms.Button();   
113. buttonMoveUp.Location = new System.Drawing.Point(FIRSTMBUTTON_XPOS,FIRSTMBUTTON_YPOS);   
114. buttonMoveUp.Text = "<";   
115. buttonMoveUp.Size = new System.Drawing.Size(MBUTTON_LENGTH,MBUTTON_HEIGHT);   
116. buttonMoveUp.Click += new System.EventHandler(this.buttonMoveUp_Click);   
117. buttonMoveUp.Enabled = false;   
118. this.Controls.Add(this.buttonMoveUp);   
119. // buttonMoveDown   
120. this.buttonMoveDown = new System.Windows.Forms.Button();   
121. buttonMoveDown.Location = new System.Drawing.Point(SECONDMBUTTON_XPOS,SECONDMBUTTON_YPOS);   
122. buttonMoveDown.Text = ">";   
123. buttonMoveDown.Size = new System.Drawing.Size(MBUTTON_LENGTH,MBUTTON_HEIGHT);   
124. buttonMoveDown.Click += new System.EventHandler(this.buttonMoveDown_Click);   
125. buttonMoveDown.Enabled = false;
126. this.Controls.Add(this.buttonMoveDown);   
127. }
128. protected void textbox_Click(Object sender, System.EventArgs e)   
129. {   
130. this.buttonAdd.Enabled = true;   
131. if (this.listbox.Items.Count>0)   
132. EnableAllListBoxButtons();   
133. }   
134. protected void listbox_SelectedIndexChanged(object sender, System.EventArgs e)
135. {
136. nSelectedIndex = this.listbox.SelectedIndex;   
137. string szSelected = (string)this.listbox.SelectedItem;   
138. this.textbox.Text = szSelected;   
139. }   
140. protected void buttonAdd_Click(Object sender, System.EventArgs e)   
141. {   
142. if (this.textbox.Text !="")   
143. {
144. this.listbox.Items.Add(this.textbox.Text);   
145. this.textbox.Text = "";   
146. EnableAllListBoxButtons();   
147. }   
148. }   
149. protected void buttonModify_Click(Object sender, System.EventArgs e)   
150. {   
151. this.listbox.Items[nSelectedIndex] = this.textbox.Text;   
152. }   
153. protected void buttonDelete_Click(Object sender, System.EventArgs e)   
154. {   
155. nSelectedIndex = this.listbox.SelectedIndex;   
156. this.listbox.Items.Remove(nSelectedIndex);   
157. System.Console.WriteLine("Remove fn does not work...");   
158. }   
159. protected void buttonClose_Click(Object sender, System.EventArgs e)   
160. {   
161. this.Close();   
162. }   
163. protected void buttonMoveUp_Click(Object sender, System.EventArgs e)   
164. {   
165. if (this.listbox.SelectedIndex >0)   
166. this.listbox.SelectedIndex--;   
167. }   
168. protected void buttonMoveDown_Click(Object sender, System.EventArgs e)   
169. {   
170. if (this.listbox.SelectedIndex < this.listbox.Items.Count-1)   
171. this.listbox.SelectedIndex++;   
172. }   
173. private void EnableAllListBoxButtons()   
174. {
175. this.buttonAdd.Enabled = true;   
176. this.buttonModify.Enabled = true;   
177. this.buttonDelete.Enabled = true;   
178. this.buttonMoveUp.Enabled = true;   
179. this.buttonMoveDown.Enabled = true;   
180. }   
181. [STAThread]   
182. public static void Main(string[] args)   
183. {   
184. Application.Run(new ListBox());   
185. }   
186. } // class   
187. } // namespace

Kindly upvote please,

Thank you.