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POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
 

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  1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
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    <p>I think I understand ViewState pretty well, but the following is giving me some troubles: </p> <p>From <em><a href="http://weblogs.asp.net/infinitiesloop/archive/2006/08/03/truly-understanding-viewstate.aspx" rel="nofollow noreferrer">http://weblogs.asp.net/infinitiesloop/archive/2006/08/03/truly-understanding-viewstate.aspx</a></em></p> <blockquote> <p>Postback controls such as dropdownlist and textbox restore their posted state (the selected item of a dropdown ist 'posted') even when ViewState is disabled, because even with ViewState disabled the control is still able to post its value</p> </blockquote> <p><br></p> <p>Assuming <em>DropDownList</em> has <em>EnableViewState</em> set to false, then ( according to the above quote ) when user issues a postback by selecting an item in <em>DropDownList</em>, the following code should result in <em>Label1.Text</em> displaying a value of a selected item ( thus <em>DropDownList.SelectedValue</em> should return a value selected by user, even if viewstate is disabled ), but instead I get an empty string:</p> <pre><code>protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { string[] number = {"first","second","third"}; DropDownList1.DataSource = number; this.DataBind(); } if (IsPostBack) { Label1.Text = DropDownList1.SelectedValue; // displays empty string // Label1.Text = DropDownList1.SelectedItem.Text; // causes an exception // Label1.Text = DropDownList1.SelectedIndex.ToString(); // displays empty string } } </code></pre> <p><br></p> <p>The author of that article appears to be an expert on the subject, so I'm assuming I'm doing something wrong !?!</p> <p><br></p> <p>thanx</p>
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    1. USMaurizio In denmark
    1. USSourceC
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. VO
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      1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
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      1. VTUpMod
    2. VO
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      1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
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      1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
      1. This table or related slice is empty.
      1. VTUpMod
    1. COWhat do you see when you check Request[DropDownList1.ClientID] on postback?
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      1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
      1. USSerhat Ozgel
    2. COOn postback Request[DropDownList1.ClientID] does return selected value
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      1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
      1. USSourceC
    3. COI am not sure that ClientID is the best option... I thing is UniqueID that is the one that match in `Request.Form[DropDownList1.UniqueID]`
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      1. POEven if DropDownList has its viestate disabled, SelectedValue should still return a value
      1. USJaider
 

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