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Losing data in a password textbox on postback

Posted on 2010-09-22
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Last Modified: 2012-05-10
I have a password textbox in my page.Also there is drwopdownlist in same form.my problem is when i changing an item in the drowdownlist,password textbox also get cleared.How can i solve this.The entire thing is inside a tab page.  
<ajaxToolkit:TabPanel ID="tpUserMgmt" runat="server" HeaderText="User Management">
<asp:UpdatePanel ID="Panel_UserProf" runat="server">
  <ContentTemplate>
 <asp:TextBox ID="txt_Pwd" runat="server" MaxLength="15" TextMode="Password"  ValidationGroup="CreateUser" Width="130px">
<asp:DropDownList ID="dd_Dsgnt" runat="server" Width="130px" OnSelectedIndexChanged="dd_Dsgnt_SelectedIndexChanged"
                                                        AutoPostBack="true">
                                                    </asp:DropDownList>
   </ContentTemplate>
   </asp:UpdatePanel>
</ajaxToolkit:TabPanel>
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Question by:vivekpv10
5 Comments
 
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by:
existenz2 earned 1000 total points
ID: 33741481
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Expert Comment

by:robasta
ID: 33741710
1.AutoPostBack="true" on a Dropdownlist will do a postback
2. TextMode="Password" on a Textbox will clear contents after a postback

There are different ways to solve this 'by design' scenario. The following are suggestions:

a) Save the password in session or in a hidden field and put it back after the postback(not sure about the security risks involved here).
b) Add the textbox below the dropdown, so that the user enters password after drop down has already done a postback
c) Take the textbox outside the updatepanel
d) place the password box on a seperate tab...
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Author Comment

by:vivekpv10
ID: 33742034
anyone know how it can be implemented using javascript??pls post that code also
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Assisted Solution

by:revaluser
revaluser earned 1000 total points
ID: 33742225
which ever the action is causing the postback action place this code

string strPasswordValue = TextBox1.Text.Trim();
TextBox1.Attributes.Add("Value", strPasswordValue);

Over there

like

protected void Button1_Click(object sender, EventArgs e)
    {
        string strPasswordValue = TextBox1.Text.Trim();
        TextBox1.Attributes.Add("Value", strPasswordValue);
    }
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Author Closing Comment

by:vivekpv10
ID: 33742353
awesome ansers..its working
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