This Arttical i will explain How to bind data in Dropdownlist in ASP.NET.
Example
| <%@ Page Language="C#" %> <script runat="server"> protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { string[] CarArray = new string[4] {"Ford", "Honda", "BMW", "Dodge"}; string[] AirplaneArray = new string[3] {"Boeing 777", "Boeing 747", "Boeing 737"}; string[] TrainArray = new string[3] {"Bullet Train", "Amtrack", "Tram"}; if (DropDownList1.SelectedValue == "Car") { DropDownList2.DataSource = CarArray; } else if (DropDownList1.SelectedValue == "Airplane") { DropDownList2.DataSource = AirplaneArray; } else { DropDownList2.DataSource = TrainArray; } DropDownList2.DataBind(); DropDownList2.Visible = true; } protected void Button1_Click(object sender, EventArgs e) { Response.Write("You selected <b>" + DropDownList1.SelectedValue.ToString() + ": " + DropDownList2.SelectedValue.ToString() + "</b>"); } </script> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <title>DropDownList Page</title> </head> <body> <form id="form1" runat="server"> <div> Select transportation type:<br /> <asp:DropDownList ID="DropDownList1" runat="server" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged" AutoPostBack="true"> <asp:ListItem>Select an Item</asp:ListItem> <asp:ListItem>Car</asp:ListItem> <asp:ListItem>Airplane</asp:ListItem> <asp:ListItem>Train</asp:ListItem> </asp:DropDownList> <asp:DropDownList ID="DropDownList2" runat="server" Visible="false"> </asp:DropDownList> <asp:Button ID="Button1" runat="server" Text="Select Options" OnClick="Button1_Click" /> </div> </form> </body> </html> |
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