dropdown selected index

Hi guys,

I careted dynamic drpdown in asp page. when i change dropdown value i want to reload the page. when realod the page i don't relod dropdown. in drop down i just want chaged value. can any one explain how to this one and can any one give samplecode for this one ASAP?

Example:

when page load i have some x value. now selected another value some y. After that when i submit the page dropdown value comes x. But i want to display one y .

Thanks

 

You can set the dropdownlist's AutoPostBack property to true to cause the post back.

Then simply only bind the drop down data if it is not a post back. ASP.NET has a built in variable for this called IsPostBack.

this.DropDown1.AutoPostBack = true;

if(!IsPostBack)
{
    BindDropDownListData();
}

Code (markup):

 

Thanks for your reply! I am new to asp. In asp can give some complete sample code.(with dropdown creation,binding, and selectedindex event)
Thanks

 

protected void Page_Load( object sender, EventArgs e )
{
        If(!IsPostBack)
             BindDropDown();

        BindData();
}

private void BindDropDown()
{
        this.ddCats.DataSource = GetDataToBind();
        this.ddCats.DataBind();
}

private void BindData()
{
        //bind the data on your page
}

Code (markup):

 

Within the BindData() event you can bind other controls on the page using

if(this.DropDownMenu.SelectedIndex == 0)
     dothis;

Code (markup):

or

if(this.DropDownMenu.SelectedValue = "Red")
     dothis;

Code (markup):