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POSet selected index in a Dropdownlist in usercontrol
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  1. POSet selected index in a Dropdownlist in usercontrol
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    copied!<p>I'm fairly new to usercontrols. So far, I've found them quite useful for handling large amounts of repeating user input fields. However, I'm having a problem with prepopulating a dropdownlist in the control. I add a ddl to my ascx page then I bind the ddl and expose it:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { List&lt;Travel_CarSize&gt; tc = Travel_CarSizes.GetCarSizes(); ddlCarSize.DataSource = tc; ddlCarSize.DataTextField = "CarSize"; ddlCarSize.DataValueField = "CarSizeID"; ddlCarSize.DataBind(); } } public string CarSize { get { return ddlCarSize.SelectedValue.ToString(); } set { ddlCarSize.SelectedIndex = ddlCarSize.Items.IndexOf(ddlCarSize.Items.FindByValue(value)); } } </code></pre> <p>However, when I programatically try to set a selection for the ddl in the control I always end up setting it THEN binding it. In my aspx.cs file I set:</p> <pre><code>CarControl1.CarSize = "3"; </code></pre> <p>The program is designed to display an empty usercontrol (with a databound ddl) and a gridview. The user selects a gridview entry and that usercontrol gets filled with the data. So the ddl gets bound from the start then the events happen that lead to the "pre-selected" ddl.</p> <p>When this didn't give me the result I was looking for I put a breakpoint on the if(!IsPostBack), the ddlCarSize.DataBind(); and the set{}. I run the program, it binds my ddl and I make a selection in the gridview. When I click the select I found that it hits the if(!IsPostBack) in the usercontrol and says "Oh, this is a postback, don't go in the if." then it hits the set{} but the ddl is empty now. Then it hits the if(!IsPostBack) again and for some reason now says it's not a postback and rebinds the ddl.</p> <p>I figure this is a pretty common problem but I've yet to find a solution. Any help would be greatly appreciated.</p>
 

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