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참고용 링크

링크: https://docs.microsoft.com/en-us/aspnet/web-forms/overview/ajax-control-toolkit/combobox/how-do-i-use-the-combobox-control-cs

링크 : http://dotnetslackers.com/articles/aspnet/Custom_ASPNET_ComboxBox_Control.aspx 

<%@ Page Language="C#" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    
    protected void btnSubmit_Click(object sender, EventArgs e)
    {
        lblSelection.Text = "You picked " + ComboBox1.SelectedItem.Text;        
    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Static</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        
        Describe how spicy you like your food:
        <br />
        <cc1:ComboBox ID="ComboBox1" runat="server">
            <asp:ListItem Text="Mild" Value="0" />
            <asp:ListItem Text="Medium" Value="1" />
            <asp:ListItem Text="Hot" Value="2" />
        </cc1:ComboBox>
        
        <asp:Button
            ID="btnSubmit"
            Text="Submit"
            Runat="server" OnClick="btnSubmit_Click" />

        <hr />
        <asp:Label
            ID="lblSelection"
            Runat="server" />
    
    </div>
    </form>
</body>
</html>

 

<%@ Page Language="C#" %>
<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <br />
        
        Select your favorite movie:
        <br />
        <cc1:ComboBox 
            ID="ComboBox1"
            DataSourceID="SqlDataSource1" 
            DataTextField="Title" 
            DataValueField="Id" 
            MaxLength="0" 
            runat="server" >
        </cc1:ComboBox>
     
        <asp:SqlDataSource 
            ID="SqlDataSource1"  
            ConnectionString="<%$ ConnectionStrings:ConnectionString %>" 
            SelectCommand="SELECT * FROM [Movies]"
            runat="server">
        </asp:SqlDataSource>
     
    </div>
    </form>
</body>
</html>
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