WebForm control and webform Control

WebForm control and webform Control

Simple controls

Text:

Label -- display text

Border

To set: 1. border color 2. Border Style 3. Border Width

Attribute: BackColor

BorderColor/BorderStyle/BorderWidth -- set the border

Literal

It is generally used to output JS Code.

TextBox: text input box

Attribute: TextMode -- MultLine multi-line (text field) is compiled as Textarea

Password single-line Password box

Singleline single-line text box

Wrap -- automatic line feed

Enable -- available or not

Readonly -- read-only

The maximum length of maxlength, used to limit the number of characters entered by the user.

 

Button class:

Button, compiled as submit

<input type="submit" name="Button1" value="Button" id="Button1" />

OnclientClick: click Event on the server, compiled as click

Confirm -- verify and judge

 

ImageButton -- image button

The ImageUrl attribute specifies the image address.

LinkButton -- hyperlink

Hyperlink -- Hyperlink style button

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Login:

Webform database connection method-No namespace

Class to be added to App_Code

 

Delegate:

Loading events:

Button1.Click + = button#click;

Void button#click (object sender, EventArgs e) {string Uname = TextBox1.Text; string Pwd = TextBox2.Text; bool isok = new UserDA (). select (Uname, Pwd); if (isok) Literal1.Text = "<script> alert ('login successfully') </script> "; else Literal1.Text = "<script> alert ('logon failed') </script> ";}

Data Category:

Public class UserDA {SqlConnection conn = null; SqlCommand cmd = null; public UserDA () {conn = new SqlConnection ("server = .; database = Data0617; user = sa; pwd = 123 "); cmd = conn. createCommand ();} /// <summary> /// user verification /// </summary> /// <param name = "Username"> verify the user name </param> /// <param name = "Pwd"> verify password </param> // <returns> </returns> public bool Select (string Username, string Pwd) {bool has = false; cmd. commandText = "select * from Users where Username = @ user and Password = @ pwd"; cmd. parameters. clear (); cmd. parameters. addWithValue ("@ user", Username); cmd. parameters. addWithValue ("@ pwd", Pwd); conn. open (); SqlDataReader dr = cmd. executeReader (); if (dr. hasRows) {has = true;} conn. close (); return has ;}

 

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Composite Control:

Name: used by the server.

Id: used by the client.

DropDownList-- Compile to Select option
1. Put data in

<asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>

<Asp: Button ID = "Button1" runat = "server" Text = "Button 1"/>
<Asp: Label ID = "Label1" runat = "server" Text = "Label"> </asp: Label>

Using System; using System. collections. generic; using System. linq; using System. web; using System. web. UI; using System. web. UI. webControls; public partial class _ Default: System. web. UI. page {protected void Page_Load (object sender, EventArgs e) {// first binding method: // DropDownList1.DataSource = new NationData (). select (); // the data source points to // DropDownList1.DataTextField = "NationName"; // display field binding // DropDownList1.DataValueField =" NationCode "; // hide the field binding // DropDownList1.DataBind (); // The second binding method is: if (! IsPostBack) {List <Nation> Nlist = new NationData (). select (); foreach (Nation n in Nlist) {ListItem li = new ListItem (n. nationName, n. nationCode); if (li. value = "N003") {li. selected = true;} RadioButtonList1.Items. add (li) ;}} Button1.Click + = button#click; // button 1 Click Event} void button#click (object sender, EventArgs e) {string end = ""; foreach (ListItem li in RadioButtonList1.Items) {if (li. selected) {end + = li. text + "-" + li. value + "," ;}} Label1.Text = end ;}}

 

ListBox

Multiple options:-SelectionMode

RadioButtonList

CheckBoxList

RepeatDirection = "Horizontal" Horizontal arrangement, Vertical arrangement

RepeatColumns = "3": three rows in a row

RepeatLayout = "UnorderedList unordered

RepeatLayout = "OrderedList ordered

RepeatLayout = "Flow" streaming layout. The compiled layout is span.