I really need some help because I can't figure it out myself. Despite I have followed many tutorial my dropdownlist is always returning the first value. So today I've decided to use a code that it should work since it's from msdn.microsoft web site.
I've tried into my index.aspx both c# codes but neither works, it's always return to 'white' (first value). Can anyone please enlighten me. (ps: I've to use .NET 3.5 mvc2 and I'm using vs 2008)
What I am trying to achieve: If I select a value from the dropdown menu, it should keep (and pass) that value.
Thanks.
My index.aspx, code from msdn.microfost 'DropDownList Class'.
<%@ Page Language="C#" AutoEventWireup="True" %><%@ Import Namespace="System.Data" %><!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" ><script runat="server" >
void Selection_Change(Object sender, EventArgs e)
{
// Set the background color for days in the Calendar control
// based on the value selected by the user from the
// DropDownList control.
Calendar1.DayStyle.BackColor =
System.Drawing.Color.FromName(ColorList.SelectedItem.Value);
}
void Page_Load(Object sender, EventArgs e)
{
// Load data for the DropDownList control only once, when the
// page is first loaded.
if(!IsPostBack)
{
// Specify the data source and field names for the Text
// and Value properties of the items (ListItem objects)
// in the DropDownList control.
ColorList.DataSource = CreateDataSource();
ColorList.DataTextField = "ColorTextField";
ColorList.DataValueField = "ColorValueField";
// Bind the data to the control.
ColorList.DataBind();
// Set the default selected item, if desired.
ColorList.SelectedIndex = 0;
}
}
ICollection CreateDataSource()
{
// Create a table to store data for the DropDownList control.
DataTable dt = new DataTable();
// Define the columns of the table.
dt.Columns.Add(new DataColumn("ColorTextField", typeof(String)));
dt.Columns.Add(new DataColumn("ColorValueField", typeof(String)));
// Populate the table with sample values.
dt.Rows.Add(CreateRow("White", "White", dt));
dt.Rows.Add(CreateRow("Silver", "Silver", dt));
dt.Rows.Add(CreateRow("Dark Gray", "DarkGray", dt));
dt.Rows.Add(CreateRow("Khaki", "Khaki", dt));
dt.Rows.Add(CreateRow("Dark Khaki", "DarkKhaki", dt));
// Create a DataView from the DataTable to act as the data source
// for the DropDownList control.
DataView dv = new DataView(dt);
return dv;
}
DataRow CreateRow(String Text, String Value, DataTable dt)
{
// Create a DataRow using the DataTable defined in the
// CreateDataSource method.
DataRow dr = dt.NewRow();
// This DataRow contains the ColorTextField and ColorValueField
// fields, as defined in the CreateDataSource method. Set the
// fields with the appropriate value. Remember that column 0
// is defined as ColorTextField, and column 1 is defined as
// ColorValueField.
dr[0] = Text;
dr[1] = Value;
return dr;
}
</script><head runat="server"><title> DropDownList Data Binding Example </title></head><body><form id="form1" runat="server"><h3> DropDownList Data Binding Example </h3>
Select a background color for days in the calendar.<br /><br /> <asp:Calendar id="Calendar1"
ShowGridLines="True"
ShowTitle="True"
runat="server"/><br /><br /> <table cellpadding="5"><tr><td>
Background color:</td></tr><tr><td><asp:DropDownList id="ColorList"
AutoPostBack="True"
OnSelectedIndexChanged="Selection_Change"
runat="server"/></td></tr></table></form></body></html>