Asp.Net Dropdownlist

Question

I Bind the Dropdownlist at runtime and data is populated to the database. Its ok Fine. But if i want to select the particular value and display in a message box. It only shows the default value.

Here My code is:

protected void Button1_Click(object sender, EventArgs e)
{
    Response.Write("You have selected " + DropDownList1.SelectedItem.Value);
  }

So how can i display the selected value in the message box. Here i am very new. Please help me.

Select the Checkmark/Tick against the answer you found useful — V4Vendetta
– V4Vendetta, Commented Apr 26, 2011 at 11:11

Paul Roub · Accepted Answer · 2016-02-19 16:55:52Z

2

The problem is in your Page_load event, where you are assigning your Datasource. When you click the button, Page_load will be called again and it will rebind to your dropdown again.

It should be:

protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        //Set your dropdown datasource here...
    }
}

edited Feb 19, 2016 at 16:55

Paul Roub

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answered Apr 26, 2011 at 6:34

Muhammad Akhtar

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4 Comments

Muhammad Akhtar Over a year ago

so what was the issue finally ? which solution helped you ?

Emad Mokhtar Over a year ago

That's right every time your page will postback it'll populate the ItemList of DropDownList and set the SelectedIdex, SelectedValue, & SelectedItem to the default ones, so put the population on !PostBack aka HTTP GET

galvin Verghese Over a year ago

Problem was i am not using the page.ispostback, so that was the error. So now it is working fine. Thank u very much

Muhammad Akhtar Over a year ago

then you accepted the wrong answer, As I mention the page.Ispostback issue. You must have to do correction in your acceptance.

Muhammad Umair · Accepted Answer · 2011-04-26 06:39:06Z

-1

Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
    Response.Write("<script>alert('You have selected ' + '" + DropDownList1.SelectedValue + "')</script>")
End Sub

answered Apr 26, 2011 at 6:39

Muhammad Umair

305 bronze badges

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