Combined Code of asp.net WinForm TextBox event

Asp tutorial. net winform textbox event combination code

Functional requirements:

The user name cannot be blank.

The user's age must be a number greater than or equal to 0;

User address cannot be blank

The user's role must be "software" or be blank

The textchanged, keypress, and validating events are used in this function. According to the functional requirements, the user name text box and the user address text box use the same event emptyvalidating to determine whether the text box is empty;

This function uses the tag attribute of the space to set the data of the control. In the constructor, we set the user name text box, user address text box, and user age text box, the value of the tag in the user title text box is false.

Use keypress events -- delete unwanted characters before they are displayed in the text box.

 

Code

   

    1 public partial class form1: form
    
2 {
    
3 public form1 ()
    
4 {
    
5 initializecomponent ();
    
6 this. button1.enabled = false;
    
7}
    
 8 
    
9 private void emptyvalidating (object sender, canceleventargs e)
    
10 {
    
11 textbox tb = (textbox) sender;
    
12 if (tb. text. length = 0)
    
13 {
    
14 tb. backcolor = color. red;
    
15 tb. tag = false;
    
16}
    
17 else
    
18 {
    
19 tb. backcolor = systemcolors. window;
    
20 tb. tag = true;
    
21}
    
22 validateok ();
    
23}
    
24 public void validateok ()
    
25 {
    
26 this. button1.enabled = (bool1_this.txt name. tag & (bool1_this.txt address. tag & (bool1_this.txt age. tag & (bool1_this.txt occuption. tag;
    
27}
    
28
    
29 private void txtoccuption_validating (object sender, canceleventargs e)
    
30 {
    
31 textbox tb = (textbox) sender;
    
32 if (tb. text. length = 0 | tb. text. compareto ("software") = 0)
    
33 {
    
34 tb. tag = true;
    
35 tb. backcolor = systemcolors. window;
    
36
    
37}
    
38 else
    
39 {
    
40 tb. tag = color. red;
    
41 tb. backcolor = color. red;
    
42}
    
43 validateok ();
    
44}
    
45
    
46 private void txtage_keypress (object sender, keypresseventargs e)
    
47 {
    
48 if (e. keychar <48 | e. keychar> 57) & e. keychar! = 8)
    
49 {
    
50 e. handled = true;
    
51
    
52}
    
53
    
54
    
55}
    
56
    
57 private void txtage_validating (object sender, canceleventargs e)
    
58 {
    
59 textbox tb = (textbox) sender;
    
60 if (tb. text. length = 0)
    
61 {
    
62 tb. tag = false;
    
63 tb. backcolor = color. red;
    
64}
    
65 else
    
66 {
    
67 tb. tag = true;
    
68 tb. backcolor = systemcolors. window;
    
69}
    
70 validateok ();
    
71}
    
72
    
73 private void messagechanged (object sender, eventargs e)
    
74 {
    
75 textbox tb = (textbox) sender;
    
76 if (tb. text. length = 0 & tb. name! = "Txtoccuption ")
    
77 {
    
78 tb. tag = false;
    
79 tb. backcolor = color. red;
    
80}
    
81 else if (tb. name = "txtoccuption" & (tb. text. length! = 0 & tb. text. compareto ("software ")! = 0 ))
    
82 {
    
83 tb. tag = false;
    
84 // tb. backcolor = color. red;
    
85}
    
86 else
    
87 {
    
88 tb. tag = true;
    
89 tb. backcolor = systemcolors. window;
    
90}
    
91 validateok ();
    
92}
    
93
    
94 private void button#click (object sender, eventargs e)
    
95 {
    
96 this.txt output. text = "";
    
97 this.txt output. text + = "name:" + this.txt name. text + "rn" + "address:" + this.txt address. text + "rn" + "title:" + this.txt occuption. text + "rn" + "age:" + this.txt age. text;
    
98}
    
99}