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when I click on the submit button of contact us form . it automatically goes to top of the page . but i want to reload specific part of page

I am developing single page website using asp.net , at bottom of my page I have created contact us form. problem is that when I click on the submit button of contact us form . it automatically goes to top of the page html code is here `
<form id="form1" runat="server">
<div>
<h2>Contact Us</h2>
<br />
<table>
<!-- Name -->
<tr>
<td align="center">
Name:</td>
<td>
<asp:TextBox ID="txtName"
runat="server" BackColor="Transparent"
Columns="50"></asp:TextBox>
</td>
</tr>
<!-- Subject -->
<tr>
<td align="center">
Subject:
</td>
<td>
<asp:TextBox ID="ddlSubject" runat="server"></asp:TextBox>
</td>
</tr>
<!-- Message -->
<tr>
<td align="center">
Message:
</td>
<td>
<asp:TextBox ID="txtMessage"
runat="server"
Columns="40"
Rows="6"
TextMode="MultiLine"></asp:TextBox>
</td>
</tr>
<!-- Submit -->
<tr align="center">
<td colspan="2">
<a href="#btnSubmit">
<asp:Button ID="btnSubmit" runat="server" Text="Submit"
onclick="btnSubmit_Click" /></a>
</td>
</tr>
<!-- Results -->
<tr align="center">
<td colspan="2">
<asp:Label ID="lblResult" runat="server"></asp:Label>
</td>
</tr>
</table>
</div>
</form>`

Use UpdatePanel or if you really want to do a SPA please consider using AJAX for the development of the site and just write the webservices.

Set this in your Page_Load function:
Page.MaintainScrollPositionOnPostBack = true;
If you wish to return to the same scroll location on the page after the button is clicked.

You need to add MaintainScrollPositionOnPostback="true" to the "<%# Page" tag, you can also set it in code-behind or web.config:
http://blogs.msdn.com/b/webdevelopertips/archive/2009/06/08/tip-75-did-you-know-how-to-maintain-scrollposition-after-post-back.aspx

html input of type File wrapped inside ASP: Panel is not disabled when panel is disabled

I have wrapped HTML Input control of type File inside ASP:Panel control(which is wrapped inside update panel).
When I disable ASP:Panel control, input control is still enable. Please helpme out
ASPX Code :
<asp:Panel ID="pnlBrowseCSV" runat="server" Enabled="true">
<table>
<tr>
<td align="left" valign="top" style="height: 30px; width: 160px;">
<strong>CSV File:</strong>
</td>
<td style="height: 30px">
<input type="file" id="csvFile" runat="server"
onkeydown="return false" style="width: 350px; background-color:white"/>
<strong>(*.csv)</strong>
</td>
<td style="height: 30px">
<ASP:Button ID="btnValidate" Text="Validate" runat="server"
OnClick="btnValidate_Click" />
</td>
</tr>
</table>
</asp:Panel>

Using visible attribute instead of Enabled.
<asp:Panel ID="pnlBrowseCSV" runat="server" Visible="False">

This issue is by design. What you can do rather is write one extra line of code to disable File upload where you disable the panel.
pnlBrowseCSV.Enabled = false;
csvFile.Enabled=false;

How to invoke Html button control in repeater control

Below is my code,can anyone please guide me in invoking the html button on repeater control.
Mark up:
<asp:Repeater ID="rptList" runat="server" onitemcommand="rptList_ItemCommand1">
<HeaderTemplate>
<table id="tbllist">
<tr>
<th>Qty</th>
<th width="100%" align="left">Item</th>
<th></th>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td align="center"><%# Eval("Quantity")%></td>
<td align="left"><%# Eval("ItemName")%></td>
<td align="center"><input id="Button1" runat="server" commandname="btnAdd" type="button" value="Addtocart" /></td>
</tr>
</ItemTemplate>
<FooterTemplate>
</table>
</FooterTemplate>
.CS file code:
protected void rptList_ItemCommand1(object source, System.Web.UI.WebControls.RepeaterCommandEventArgs e)
{
if (e.CommandName == "btnAdd")
{
Response.Write("hello,I am a button.");
}
}

You have used input without runat="server"
Change
<input id="btnAddtocart" type="button" value="Addtocart" />
To
<input id="btnAddtocart" runat="server" type="button" value="Addtocart" CommandName="CommandName"/>
Use asp:button instead of input type="button"
<asp:Button ID="btnAddtocart" runat="server" CommandName="CommandName"/>

You have used input without runat="server", You need to add runat="server" to make a button server button control and perform postback
Change
<input id="btnAddtocart" type="button" value="Addtocart" />
To
<input id="btnAddtocart" runat="server" type="button" value="Addtocart" />
Use asp:button instead of input type="button" if you do not have any particular reason for using it.
<asp:Button ID="btnAddtocart" runat="server" Text="Addtocart" CommandName="Addtocart"/>

Required Validator and compare validators do not work!

I am trying to see the validation part working. I have few required field validators and compare field validators, etc.
<div>
<asp:RequiredFieldValidator ID="rfvCompany" ValidationGroup="groupProfile"
ControlToValidate="txtCompany" runat="server"
ErrorMessage="- Company Name Required" Display="Dynamic" />
</div>
<div>
<asp:RequiredFieldValidator ID="rfvAddress" ValidationGroup="groupProfile"
ControlToValidate="txtAddress" runat="server"
ErrorMessage="- Address 1 Required" Display="Dynamic" />
</div>
This is my save button, validation has to happen when this button is clicked.
<tr>
<td align="center">
<asp:ImageButton ID="btnSave" runat="server" ImageUrl="~/images/green-save.gif"
OnClick="btnSave_Click" TabIndex="22" ValidationGroup="groupProfile" />
</td>
</tr>
The popup that comes when the save button is clicked is this..
<tr>
<td colspan="2" align="left" style="padding-left: 75px; padding-top: 10px;">
Do you wish to update the Location Information as well.
</td>
</tr>
<tr>
<td align="center" colspan="4">
<asp:Button ID="btnYesMerchant" Text ="Yes" runat="server" class="popupButton"
causesvalidation="true" OnClientClick="$find('mdlpop').hide(); return true;"
onclick="btnYessave_Click"/>
<asp:Button ID = "btnNoMerchant" Text ="No" runat ="server" class="popupButton"
causesvalidation="true" OnClientClick="$find('mdlpop').hide(); return true;"
onclick="btnNosave_Click"/>
<asp:Button Id="btnCancel" Text ="Cancel" runat="server" class="popupButton" />
</td>
</tr>
Where am i doing wrong? i am in a serious mess, i guess :(

Ensure you have included the asp:ScriptManager on your page. In addition to that check for javascript errors and (if any) add them to your question.

Here i have assigned the popup to the button, so the popup is being called when the button is clicked. Now i have changed the flow. For the button, i have written a javascript function that will validate and calls the popup to show if validation is passed. This worked. Thank you all..

Javascript for a popup. Asp.net for Visual Studio 2005

What JavaScript has to be written for a popup when a link is clicked? Correct me if there is anything else to be done.
Link is written like this.
<div style="float:left; padding-left:9px;">
<asp:LinkButton ID="lnkActiveInactive" runat="server" OnClick="lnkActiveInactive_Click"
CssClass="linkclass" Font-Underline="True">Cancel My Account</asp:LinkButton>
</div>
And popup extender is like this.
<cc1:ConfirmButtonExtender DisplayModalPopupID="ModalPopupExtender2" ID="ConfirmButtonExtender2"
runat="server" TargetControlID="lnkActiveInactive">
</cc1:ConfirmButtonExtender>
<cc1:ModalPopupExtender ID="ModalPopupExtender2" OkControlID="btnYesCancel" CancelControlID="btnNoCancel"
BackgroundCssClass="modalBackground" PopupControlID="pnlCancelPopup" TargetControlID="lnkActiveInactive"
runat="server">
</cc1:ModalPopupExtender>
<asp:Panel CssClass="modalPopup" ID="pnlCancelPopup" runat="server">
<!-- Common Popup Control Begin -->
<table class="tblCommonPopup" width="690px" cellpadding="0" cellspacing="0">
<tr>
<td class="topLeft">
</td>
<td class="topMiddle">
</td>
<td class="topRight">
</td>
</tr>
<tr>
<td colspan="3" class="middle" align="center">
<!-- Content Area Begin -->
<table>
<tr>
<td>
</td>
<td colspan="2" style="padding-top: 10px;">
<table width="100%">
<tr>
<td align="center">
Feel free to change your package to Basic, there is no charge for this Package.<br /><br />If you still wish to cancel,
your account will become inactive within DealTown and any further billing will <br />discontinue.
We will keep you account in our system for some time if you wish to active it again.<br /><br />Are you sure you
wish to cancel your account?
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="center" colspan="4">
<input id="btnYesCancel" type="button" value="YES" class="popupButton" />
<input id="btnNoCancel" type="button" value="NO" class="popupButton" />
</td>
</tr>
</table>
<!-- Content Area Ends -->
</td>
</tr>
<tr>
<td class="bottomLeft">
</td>
<td class="bottomMiddle">
</td>
<td class="bottomRight">
</td>
</tr>
</table>
<!-- Common Popup Control End -->
</asp:Panel>

Im not sure if I understood your question clearly, but this is how to pop up in JS
<script type="text/javascript">
<!--
function Confirmation() {
var answer = confirm("Are you sure you want to Cancel your Account?")
if (answer){
alert("Goodbye!")
}
else{
alert("Thanks for not Cancelling")
}
}
//-->
</script>
<div style="float:left; padding-left:9px;">
<asp:LinkButton ID="lnkActiveInactive" onclick="Confirmation();">Cancel My Account</asp:LinkButton>
</div>
This code is used is you run on the client side. If you want it to run on server side you have to do it on the codebehind like such
if (!IsPostBack) {
this.lnkActiveInactive.Attributes.Add("onclick", "javascript:Confirmation()");
}

If you just want a confirmation dialog for the 'cancel my account' you can simply place some javascript in your aspx page.
Something like:
onclick="javascript:confirm()"
Hope this helps!

I think the other responders have missed that you are using the ASP.NET Ajax Toolkit ModalPopupExtender.
The answer to your question is, no, no Javascript is required. Setting the TargetControlID of the ModalPopupExtender to your LinkButton should be sufficient to get the pop-up to appear. If that's not happening, something else is wrong.
One thing I notice is that you have an OnClick handler on the LinkButton. This shouldn't be necessary if the only function of the link button is to pop up the dialog.