here the code below(.aspx)
<%@ Page Language="C#" %>
<!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 Button1_Click(object sender, EventArgs e)
{//insert
ListBox1.Items.Add(TextBox1.Text);
TextBox1.Text = "";
}
protected void Button2_Click(object sender, EventArgs e)
{//delete
//or u may use this code only "ListBox1.Items.Remove(ListBox1.Text);"
string str = ListBox1.SelectedItem.ToString();
ListBox1.Items.Remove(str);
}
protected void Button3_Click(object sender, EventArgs e)
{//update
int i = ListBox1.SelectedIndex;
ListBox1.Items.Insert(i, TextBox1.Text);
ListBox1.Items.RemoveAt(i + 1);
TextBox1.Text = "";
}
protected void Button4_Click(object sender, EventArgs e)
{//clear
ListBox1.Items.Clear();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div style="height: 427px">
<br />
<asp:ListBox ID="ListBox1" runat="server" Height="191px" Width="167px">
</asp:ListBox>
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="INSERT" />
<asp:TextBox ID="TextBox1" runat="server"
style="z-index: 1; left: 228px; position: absolute; top: 120px; margin-bottom: 0px"></asp:TextBox>
<asp:Button ID="Button2" runat="server" Text="DELETE" onclick="Button2_Click" />
<asp:Button ID="Button3" runat="server" Text="UPDATE" onclick="Button3_Click" />
<asp:Button ID="Button4" runat="server" Text="CLEAR" onclick="Button4_Click" />
</div>
</form>
</body>
</html>
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