Web-side controls, page-pass values

I. Memory Web-side controls need to mate with form elements in HTML

Label-compiled into <span> in HTML

Literal-compiled into null in HTML

Text class

• text box <input type= "text" > TextBox
• Password box <input type= "Password" > TextBox properties textmode= "Password"
• Text fields <textarea> TextBox properties Textmode= "Mutilline"
• Hide Text field <input type= "Hidden> hiddenfiled

Button class

• Normal Pushbutton button No
• Submit button (default commit)
• Reset button Reset None
• Image Button Image ImageButton

Select Class

• Radio RadioButtonList (This is not a panel, each default is a set, there are many items) property ListItem Enable selected Text Value
• CheckBox CheckBoxList (This also does not use a panel, each default is a set, there are many items) property ListItem Enable selected Text Value
• Select option DropDownList
• File (not learned)

Two. Data binding

1.Foreach Traversal (recommended)

 //Binding National InformationList<nation> Li =NewNationdata ().            Selectnation (); foreach(Nation Iinchli) {ListItem Li=NewListItem (); LI. Text=I.nationname; LI. Value=I.nationcode; if(LI. Value = ="N001") {LI. Selected=true; }            DLNATION.ITEMS.ADD (LI); }

2.

Three. Questions about binding Data refresh

Data option cannot be changed when binding data is present
Page_Load event will be executed every time the page refreshes
It will rebind the data once and then execute the button event.
Determine whether a page is first loaded or responds to a postback

if (!ispostback)
{
Only the code that executes when the page is loaded the first time is written in this area.
Note that 95% of the code is written in this area.
！ Event delegate cannot be written to this side
}

Four. Page Pass value

Value of Value-Cross page pass value
Querystring-url pass value, address value
Pass value: [Address? Key=value&key=value]

Take out the value passed by the URL.
Value: String value = request["Key"];

Five. C # service-side jump page
Response.Redirect ("url");

Web-side controls, page-pass values