DropDownList is not selecting value properly

The problem is very clear, that this dropdown is always binded and your first item became selected by default.

So binding logic should be in !IsPostBack

hi,Solution 2 is right,The binding logic should be in !IsPostBack

Hi,

I agree to solution 2 and solution 3. Alternatively you also add the following code:

DropDownList6.Items.Add(new ListItem("Please Select", "0"));

So now your dropdown list is loaded with Please Select option. The user would then need to select either Sweeper or Watchman from the dropdown list and re-directed to the appropriate page.

maybe your way has problem.
This is my way and it run is ok(it is Tested)
Auto Post Back : True(Checked)

protected void Page_Load(object sender, EventArgs e)
   {
       if (!IsPostBack)
       {
           ddl1.Items.Add(new ListItem(" ", "0"));
           ddl1.Items.Add(new ListItem("Trung", "1"));
           ddl1.Items.Add(new ListItem("tram", "2"));
       }
   }
   protected void ddl1_SelectedIndexChanged(object sender, EventArgs e)
   {
       if (ddl1.SelectedValue == "1")
       {
           Response.Redirect("Page1.aspx");
       }
       else if (ddl1.SelectedValue == "2")
       {
           Response.Redirect("Page2.aspx");
       }
   }

good lucky!!

yes i'm also agree with solution 2,3 and 4...
There is a problem in your binding logic..
i think you have add both value in page_load event
like...

// logical problem 
private void Page_Load(object sender, EvnetArgs e)
{
    DropDownList6.Items.Add(new ListItem("sweeper", "1"));
    DropDownList6.Items.Add(new ListItem("watchman", "2"));
}

you should do like this.....

//solution
private void Page_Load(object sender, EvnetArgs e)
{
   if(!IsPostback)
   {
       DropDownList6.Items.Add(new ListItem("sweeper", "1"));
       DropDownList6.Items.Add(new ListItem("watchman", "2"));
   }
}

To be more clear in this topic you should refer <a href="http://msdn.microsoft.com/en-us/library/ms178472.aspx">this</a>[<a href="http://msdn.microsoft.com/en-us/library/ms178472.aspx" target="_blank" title="New Window">^</a>] link