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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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