Develop Reference

Button Refresh Not clearing text

I'm making a captcha for my site, nothing fancy and for personal use. My problem is that when i hit the refresh button to bring up a new image in the captcha box it should reset the captcha text box as well.
I am setting it like so
protected void btnRefresh_Click(object sender, EventArgs e)
{
//This is the call that creates a new image
FillCaptcha();
// to clear the text box
txtCaptcha.Text = String.Empty;
}
When i run the debugger it shows the values entered in the text box and after when its set to "".
Here is the button and text box layout
<asp:TableRow>
<asp:TableCell>
Enter Below Captcha Code :
</asp:TableCell>
<asp:TableCell>
<asp:TextBox ID="txtCaptcha" runat="server" Width="200px"></asp:TextBox>
</asp:TableCell>
</asp:TableRow>
<asp:TableRow>
<asp:TableCell>
</asp:TableCell>
<asp:TableCell VerticalAlign="middle">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UP1" runat="server">
<ContentTemplate>
<table>
<tr>
<td style="height: 50px; width:120px; border:solid; border-color:blue; text-align:center;">
<asp:Image ID="imgCaptcha" runat="server" />
</td>
<td valign="middle">
<asp:Button ID="btnRefresh" runat="server" Text="Refresh" OnClick="btnRefresh_Click" />
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
</asp:TableCell>
</asp:TableRow> `
Ive search on Stack for some time and everyone seems to be setting it as i have it. I have the same call to the txtCaptcha.Text = String.Empty; in another function and it works fine. any help would be grateful. If I'm unclear about something let me know and ill do my best to better explain it.
Captcha layout

You should move your TextBox inside UpdatePanel. Like So:
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:UpdatePanel ID="UP1" runat="server">
<ContentTemplate>
<table>
<tr>
<td colspan="2">
<asp:TextBox ID="txtCaptcha" runat="server" Width="200px"></asp:TextBox>
</td>
</tr>
<tr>
<td style="height: 50px; width:120px; border:solid; border-color:blue; text-align:center;">
<asp:Image ID="imgCaptcha" runat="server" />
</td>
<td valign="middle">
<asp:Button ID="btnRefresh" runat="server" Text="Refresh" OnClick="btnRefresh_Click" />
</td>
</tr>
</table>
</ContentTemplate>
</asp:UpdatePanel>
Read about Introduction to the UpdatePanel Control

UpdatePanel AsyncPostBackTrigger does Postback

I've below design code containing updatepanel to the gridview and buttons as shown below -
<asp:ScriptManager ID="scrptmanager" runat="server"></asp:ScriptManager>
<div>
<asp:HiddenField ID="hdnSortValue" runat="server" />
</div>
<div class="current-btns" style="float: left !important;">
<div id="divFitnessSortBy" runat="server" class="fit-sort">
<table>
<tr>
<td>
<b>Sort by :</b>
</td>
<td>
<asp:Button ID="btnMostRecent" Text="Most Recent" class="button action sortcomments"
runat="server" OnCommand="btnMostRecent_Click" CommandArgument="date" />
</td>
<td>
<asp:Button ID="btnMostViewed" Text="Most Viewed" class="Comments" runat="server"
OnCommand="btnMostViewed_Click" CommandArgument="views" />
</td>
</tr>
</table>
</div>
<div class="clear">
</div>
</div>
<div class="hr">
</div>
<div class="BlogsPostHolderDiv" id="divPagination">
<asp:UpdatePanel ID="updtpanel" runat="server" UpdateMode="Conditional">
<ContentTemplate>
<asp:GridView ID="gvBlogsPost" runat="server" DataKeyNames="PostID" AutoGenerateColumns="False"
AllowPaging="false" Width="100%" OnRowDataBound="gvBlogsPost_Bound" GridLines="None">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<div class="current-articles">
<div class="current-thumb">
<a id="lnkThumbnail" runat="server" rel="nofollow">
<asp:Image ID="imgThumbnail" runat="server" Height="135px" Width="186px" />
</a>
</div>
<div class="current-list">
<h2>
<a id="lnkArticle" runat="server">
<%# DataBinder.Eval(Container.DataItem, "Subject")%></a>
</h2>
<div class="views-comments">
<h5>
<asp:Label runat="server" ID="lblNewsletterDate" ForeColor="#808080"><%# DataBinder.Eval(Container.DataItem, "PostDate")%></asp:Label>
<span class="gray">|</span> <span id="spnViews" runat="server"><span>
<%#Convert.ToInt64(DataBinder.Eval(Container.DataItem, "TotalViews")).ToString("#,#")%>
Views </span></span>
</h5>
</div>
<asp:Label ID="lblShortDescription" runat="server"><%#DataBinder.Eval (Container.DataItem, "Body")%> </asp:Label>
</div>
<div class="clear">
</div>
</div>
<div class="hr">
</div>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ContentTemplate>
<Triggers>
<asp:AsyncPostBackTrigger ControlID="btnMostRecent" EventName="Click" />
<asp:AsyncPostBackTrigger ControlID="btnMostViewed" EventName="Click" />
</Triggers>
</asp:UpdatePanel>
<input type="hidden" id="hdnLastArticle" value="10" />
When i click on btnMostRecent or btnMostViewed the page does postback which should not be the case...am i missing something here?
Expected - When i click on any of the given button only gvBlogsPost gridview should be updated without the whole page postback
Help and thanks in advance...!

It looks the only thing you have to do is make sure the triggers are in the same naming container.
According to MSDN:
The control that the AsyncPostBackTrigger control references must be
in the same naming container as the update panel for which it is a
trigger. Triggers that are based on controls in other naming
containers are not supported.

Unable to check RadioButton inside DataList footer Template

I have kept two radio button inside a datalist footer template but I am not at all able to select it. Below is my footer template:
<FooterTemplate>
<tr>
<td align="right" colspan="7"><br />
</td>
</tr>
<tr>
<td align="left" valign="middle" colspan="7">
<div style="background-color:#FCEE21; height:47px ;">
<div style=" position:relative; top:15px; left:20px;">
<asp:CheckBox ID="cbAgree" Checked="true" Text="I agree on all terms & conditions" runat="server" />
</div>
<div style=" position:relative; top:-1px; left:410px;">
<asp:Label ID="Label2" runat="server" Text="Total: (INR)"></asp:Label>
</div>
<div style=" position:relative; top:-22px; left:550px;">
<asp:Label ID="lbltotal" runat="server" Text="000000" Font-Size="14pt"></asp:Label>
</div>
</div>
</td>
</tr>
<tr>
<td align="right" colspan="7">
<div style="background-image: url(images/footerBg.png); height:47px ;">
<div style=" position:relative; top:10px; left:-172px;">
<asp:Label ID="Label9" runat="server" Text="Select an option: "></asp:Label>
<asp:RadioButton ID="rb1" Text="Colect" AutoPostBack="true" runat="server" GroupName="rboption"/>
<asp:RadioButton ID="rb2" Text="Deliver" AutoPostBack="true" runat="server" GroupName="rboption"/>
</div>
<div style=" position:relative; top:-18px;">
<asp:Button ID="btnSubmit" runat="server" Text="Submit" BackColor="#F8CD20" CssClass="anchor"
BorderColor="#F8CD20" BorderStyle="None" OnClick=" Submit_Clicked" Font-Bold="True" Font-Size="14pt"
Height="38px" Width="105px" />
</div>
</div>
</td>
</tr>
</FooterTemplate>
I have not done any databinding also. Please help me out, if I missed out something.

Your problem is about your css styling. If you remove inline css styles from your divs you can click them.
Those divs are displaying on top of each other without proper styles and radiobuttons stay under another div, prevents you clicking on them.
Or if you want to keep the styles and still click them you can use "z-index" attribute with adding z-index:1;, so you bring the div with radiobuttons, above the other div, making them clickable.
....
<div style=" position:relative; top:10px; left:-172px; z-index:1;">
<asp:Label ID="Label9" runat="server" Text="Select an option: "></asp:Label>
<asp:RadioButton ID="rb1" Text="Colect" AutoPostBack="true" runat="server" GroupName="rboption"/>
<asp:RadioButton ID="rb2" Text="Deliver" AutoPostBack="true" runat="server" GroupName="rboption"/>
</div>
....

Image tag not updating inside the UpdatePannel

I hope you are coding well,
I am working on a Image Upload module , which is in a Modal Popup and hence is wrapped inside an Update Panel,
<asp:UpdatePanel runat="server" ID="UpdateModelPopup" UpdateMode="Conditional" ChildrenAsTriggers="true">
<Triggers>
<asp:AsyncPostBackTrigger ControlID="lnkUploadImage" EventName="Click" />
</Triggers>
<ContentTemplate>
<asp:Panel runat="server" ID="pnlModel" CssClass="ModalWindow">
<!-- Style="display: none;" -->
<table border="0" class="modalTable" cellspacing="5">
<tr>
<td>
Keywords 2<strong><font color="#FF0000">*</font></strong> <i>(Seperated by , )</i>
<br />
<asp:TextBox runat="server" ID="txtKeywordsTwo"></asp:TextBox><br />
</td>
<td>
Dimensions <strong><font color="#FF0000">*</font></strong>
<br />
Width :
<asp:TextBox ID="txtDimWidth" runat="server" Width="50px"></asp:TextBox>
Height :
<asp:TextBox ID="txtDimHeight" runat="server" Width="50px"></asp:TextBox>
</td>
<tr>
<td colspan="2">
<hr />
</td>
</tr>
<tr>
<td>
Browse .psd file<br />
<ajaxToolkit:AsyncFileUpload runat="server" ID="pdfFile" Width="200px" OnUploadedComplete="pdfFile_UploadedComplete"
CompleteBackColor="" ErrorBackColor="" OnClientUploadComplete="Success" />
<asp:Image runat="server" ID="imgThumbNail" /><br />
<font color="#FF0000">or</font><br />
Refrence URL<br />
<asp:TextBox ID="TextBox11" runat="server"></asp:TextBox>
</td>
<td>
Browse file <i>(.jpeg, .gif or .png)</i><strong><font color="#FF0000">*</font></strong><br />
<ajaxToolkit:AsyncFileUpload runat="server" ID="AsyncFileUpload1" Width="200px" />
</td>
</tr>
</table>
<asp:Button runat="server" ID="btnUpload" Text="Upload" CssClass="btn" OnClick="btnUpload_Click" />
</asp:Panel>
</ContentTemplate>
</asp:UpdatePanel>
Now as per the business requirement, I need to show a thumbnail of the Image that user uploads, and for .psd file I have a standard icon which I display's at the run time, in the code behind I am validating the file extension to be the .psd file and it is then display the psd icon, I am trying to set the ImageURL for
protected void pdfFile_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
if (Path.GetExtension(e.FileName).ToString().ToLower() != ".psd")
{
string alertMsg = #"alert('Please provide .PSD type file');";
ScriptManager.RegisterStartupScript(this, this.GetType(), "Test", alertMsg, true);
//pdfFile
}
else
{
imgThumbNail.ImageUrl ="~/images/psdIcon.jpg";
}
}
The problem is that Panel doesnt gets update at the run time, even the page source shows src="". I am suspecting that its a Update Panel issue.
Kindly point me into the right direction.
Thanks in advance

FileUpload can not be done Asynchronously. In order to do that PostBackTrigger Trigger will be required to upload.

Button not firing onClick below Panel controls in IE

I have a button which is not working when placed below two panels. If I move it above the panels, it works.
It works either way in Firefox. It does not work in IE 8
The button runs this code
protected void Button2_Click(object sender, EventArgs e)
{
panelForm.Enabled = true; //input panel
panelOutput.Visible = false; //output panel
Button1.Visible = true; //input panel button
}
I have some workarounds, but was hoping to find the cause of the issue.
edit: here is the markup of the second panel and button. I've tried moving the button outside of the panel and get the same result.
<asp:Content ID="MainContent" Runat="Server" ContentPlaceHolderID="MainContentPlaceHolder">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<asp:TextBox ID="domainUserID" runat="server" Visible="false"></asp:TextBox>
<!-- gray bar and title -->
<table style="width:100%; border-style:none;">
<tr>
<td class="com_headline">
SQL Emergency Request [Home]
</td>
</tr>
<tr class="com_app_instructions">
<td>
<p>Words here</p>
</td>
</tr>
</table>
<!-- end title and gray bar -->
<asp:Panel ID="panelForm" runat="server" Visible="True" CssClass="myform">
<form method="post" action="Default.aspx" id="form">
<h1>Request Form</h1>
<p>Complete this form to be issued a login</p>
<table cellpadding="5px">
<tr>
<td>
IR Number
<br />
<span class="small">Obtain your IR number from
SMART</span>
</td>
<td>
<asp:TextBox ID="txtIR" runat="server"></asp:TextBox>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txtIR" CssClass="errorMsg"
ErrorMessage="Please Enter Your IR Number">
</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
Server
<br />
<span class="small">MSSQL5 is supported for now</span>
</td>
<td>
<asp:DropDownList ID="ddServer" runat="server" AutoPostBack="True"
Enabled="False" onselectedindexchanged="ddServer_SelectedIndexChanged">
<asp:ListItem>DEVMSSQL05</asp:ListItem>
<asp:ListItem Selected="True">MSSQL05</asp:ListItem>
</asp:DropDownList>
</td>
<td>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="ddServer" CssClass="errorMsg"
ErrorMessage="Please Choose A Server">
</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td>
Database
<br />
<span class="small">You have the role of 'Analyst' in these databases</span>
</td>
<td>
<asp:DropDownList ID="ddDatabase" runat="server" AppendDataBoundItems="true"
AutoPostBack="false" DataSourceID="DatabaseDropDownObjectDataSource"
DataTextField="DatabaseName" DataValueField="DatabaseName" Width="150">
</asp:DropDownList>
</td>
<td>
</td>
</tr>
<tr>
<td></td>
<td>
<asp:Button ID="Button1" runat="server" CssClass="com_btn_flat"
onclick="Button1_Click" Text="Submit" />
</td>
<td>
<div id="loader">loading...</div>
</td>
</tr>
</table>
</form>
</asp:Panel>
<asp:Panel ID="PanelError" runat="server" Visible="false" CssClass="errorPanel">
<h1><asp:Label ID="txtErrorMsg" runat="server">error text</asp:Label></h1>
</asp:Panel>
<br />
<asp:Panel ID="panelOutput" runat="server" Visible="false" CssClass="panelOutput">
<h1>
<asp:Literal ID="Title" runat="server" Text=""/>
</h1>
<p>
<asp:Literal ID="Warning" runat="server" Text=""/>
</p>
<p>
<asp:Literal ID="LoginLifeHours" runat="server" Text=""/>
</p>
<p>
<span class="important">
<asp:Literal ID="Login" runat="server" Text="" />
</span>
</p>
<p>
<span class="important">
<asp:Literal ID="PWD" runat="server" Text="" />
</span>
</p>
<br />
<p>
<asp:Button ID="Button2" runat="server" Text="Request Another Login"
onclick="Button2_Click" CssClass="com_btn_flat" />
</p>
</asp:Panel>
This is the button that is not responding in IE
<p>
<asp:Button ID="Button2" runat="server" Text="Request Another Login"
onclick="Button2_Click" CssClass="com_btn_flat" />
</p>

The problem is that you are using a <form> tag within your content page. The master page already includes a <form> tag and IE appears to be balking at the form within a form. When I removed the <form> tag from your aspx, the button handler ran under IE8.

The sample code is Button2_Click, but your button markup outside of the panels has test_button_Click as the event handler? There are three buttons, so which one are you asking about, I assume the last?

I noticed that you have a tag inside your first panel (panelForm). Also, I don't see a a tag with a runat="server" attribute (although, it could be in a master page). And it doesn't look like your button is inside a form (unless the master page has a form).
The problem is that you can only have one form on a page in Asp.NET WebForms. If you don't have any <form runat="server"> tags on your page, then you buttons will not fire any events on the code-behind.