ASP.Net/Asp Control/ComboBox

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Get selected item from a ComboBox and check its value (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <script runat=server> Sub Page_Load(ByVal Sender as Object, ByVal E as EventArgs) 

   If Not IsPostBack Then
       Panel1.Visible = True
       Panel2.Visible = False
       lblTitle.Text = "Quiz Page"
   End If

End Sub Sub SubmitBtn_Click(Sender As Object, E As EventArgs) 

   Dim TotalCorrect as Integer
   Panel1.Visible = False
   Panel2.Visible = True
   lblTitle.Text = "Results Page"
   If DDLAnswer1.SelectedItem.Text = "Second" Then
       TotalCorrect = TotalCorrect + 1
   End If
   If DDLAnswer2.SelectedItem.Text = "False" Then
       TotalCorrect = TotalCorrect + 1
   End If
   If DDLAnswer3.SelectedItem.Text = "False" Then
       TotalCorrect = TotalCorrect + 1
   End If
   lblResult.Text = "You scored " & TotalCorrect _
       & " out 3 correct."

End Sub </SCRIPT> <HTML> <HEAD> <TITLE>Quiz Sample Page</TITLE> </HEAD> <BODY> <form runat="server"> <asp:Label 

   id="lblTitle" 
   runat="server"

/> <asp:Panel 

   id="Panel1" 
   runat="server"

> <asp:Label 

   id="lblQuestion1"
   runat="server"
   Text="Question 1"

/>
<asp:DropDownList 

   id="DDLAnswer1" 
   runat=server>
   <asp:ListItem>Hour</asp:ListItem>
   <asp:ListItem>Minute</asp:ListItem>
   <asp:ListItem>Second</asp:ListItem>

</asp:DropDownList>

<asp:Label 

   id="lblQuestion2"
   runat="server"
   Font-Bold="True"
   Text="Question 2."

/>
<asp:DropDownList 

   id="DDLAnswer2" 
   runat=server>
   <asp:ListItem>True</asp:ListItem>
   <asp:ListItem>False</asp:ListItem>

</asp:DropDownList>

<asp:Label 

   id="lblQuestion3"
   runat="server"
   Font-Bold="True"
   Text="Question 3"

/>
<asp:DropDownList 

   id="DDLAnswer3" 
   runat=server>
   <asp:ListItem>True</asp:ListItem>
   <asp:ListItem>False</asp:ListItem>

</asp:DropDownList>

<asp:button 

   id="butOK"
   text="OK"
   Type="Submit"
   OnClick="SubmitBtn_Click" 
   runat="server"

/> </asp:Panel> <asp:Panel 

   id="Panel2" 
   runat="server"

> <asp:Label 

   id="lblResult"
   runat="server"
   Font-Bold="True"

/> </asp:Panel> </Form> </BODY> </HTML> 

      </source>


Get selected value from a combobox and display (C#)

   <source lang="csharp">

<%@ Page Language="c#" %> <script runat="server"> 

   void Page_Load()
   {
     if(Page.IsPostBack)
       lblMessage.Text = "You have selected " + DropList1.SelectedItem.Value;
   }

</script> <html> 

   <head>
   </head>
   <body>
       <form runat="server">
       <asp:DropDownList ID="DropList1" runat="server">
       <asp:listitem>apple</asp:listitem>
       <asp:listitem>banana</asp:listitem>
       <asp:listitem>carrot</asp:listitem>
       <asp:listitem>durian</asp:listitem>
       </asp:DropDownList>

       <asp:Button runat="server" Text="Button"></asp:Button>

       <asp:Label ID="lblMessage" runat="server"/>
       </form>
   </body>

</html> 

      </source>


Set static value for a combobox (asp:dropdownlist) (VB.net)

   <source lang="csharp">

<%@ Page Language=VB Debug=true %> <HTML> <HEAD> <TITLE>Creating a Basic DropDownList Control</TITLE> </HEAD> <form runat="server">

Select a Color:


<asp:dropdownlist id="ddl1" runat="server"> 

   <asp:listitem value="Bu">Blue</asp:listitem>
   <asp:listitem value="Re">Red</asp:listitem>
   <asp:listitem value="Gr">Green</asp:listitem>
   <asp:listitem value="Pu" Selected>Purple</asp:listitem>
   <asp:listitem value="Ba">Black</asp:listitem>
   <asp:listitem value="Go" text="Gold"/>

</asp:dropdownlist> </form> </BODY> </HTML> 

      </source>
Источник — «http://www.nfex.ru/index.php?title=ASP.Net/Asp_Control/ComboBox&oldid=2162»