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ASP.NET Web Site "The name does not exist in the current context"

Product.aspx
<asp:DataList ID="DataList1" runat="server" DataSourceID="SqlDataSource1">
<ItemTemplate>
<asp:textbox runat="server" ID="quantitytb"></asp:textbox>
<asp:Button CssClass="addtocart-button" runat="server" Text="Add to cart" ID="addtocartbutton" onclick="addtocartbutton_Click"></asp:Button>
</ItemTemplate>
</asp:DataList>
Product.aspx.cs
protected void addtocartbutton_Click(object sender, EventArgs e)
{
quantitytb.Text="1";
}
Line 1 of Product.aspx
<%# Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Product.aspx.cs" Inherits="Product" %>
Above is just a small section of how my code looks like. Any controls I add to my Product.aspx page does not work in the .cs file. There will be an error saying "The name 'control name' does not exist in the current context". Literally tried all the solutions I can find online but to no avail.
Note that I am using ASP.Net Empty Web Site and not Web Application so there's no designer.cs file.

You can't access quantitytb directly because it is within a DataList. Similar to any data-bound container (gridview, repeater, formview, etc), you must target a specific item/row to find its child controls. If your datalist has 10 items in it, that means you'll have 10 occurrences of quantitytb - if you don't specify which one you're targeting, the code will throw an error.
If you're trying to modify the textbox that's the sibling of the clicked button, perhaps what you're looking for is this:
protected void addtocartbutton_Click(object sender, EventArgs e)
{
//Find the button that was clicked
Button addToCart = (Button)sender;
//Get the button's parent item, and within that item, look for a textbox called quantitytb
TextBox quantitytb = (TextBox)addToCart.Parent.FindControl("quantitytb");
//Set that textbox's text to "1"
quantitytb.Text="1";
}

Asp.net button is not firing event

I am having an issue with the asp.net button. It is not firing event. I tried setting causes validation to false and removing the java script and validation but it still doesn't work.
<asp:Button ID="Button2" runat="server" Text="Save" onclick="Button2_Click" />
protected void Button2_Click(object sender, EventArgs e)
{
std.AddGuardianInfo(
Convert.ToInt16(DropDownList1.SelectedValue),
TextBox6.Text,
TextBox7.Text,
TextBox8.Text,
TextBox9.Text,
TextBox10.Text);
Response.Redirect("Std_FeeInfo.aspx");
}

Change onclick to OnClick in the markup of the asp:button. so the markup will be like this:
<asp:Button ID="Button2" runat="server" Text="Save" OnClick="Button2_Click" />
And an important advise for you: Use css for styling and arranging elements in your page, giving space using a sequence of will not be a good design

You want to check this steps.
#rabiya are you copied this code in some where else ? Then just remove it and double click on your asp button.
If you are using updatepanel on onclick event, this may happen.So Use 'EnableEventValidation="false"'
Example :
<%# Page Language="C#" AutoEventWireup="true" EnableEventValidation="false" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>

ModalPopupExtender Hault Execution Until Ok is Clicked?

Perhaps I misunderstood the control, or very possibly am not implementing it correctly, but I've used a ModalPopupExtender much like I'd like to use a MessageBox in desktop development. The problem I'm running into is that once I call the Show() method of the ModalPopupExtender it continues to execute the server side code despite the fact that the user has not yet clicked the button set as the OkControlID. Is this the normal behavior, and or is there a way to hault code execution until the OkControlID has been clicked. To specify, I don't want to create another event in the button click handler as this popup is inline. Here is my code - any advice is appreciated.
My Control:
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="ModalMessage.ascx.cs" Inherits="LB.ModalMessage" %>
<asp:Button ID="btnPopup" runat="server" style="display: none;"/>
<ajaxToolkit:ModalPopupExtender ID="ModalMessageExtender" runat="server"
OkControlID="btnOkay" PopupControlID="Panel1"
TargetControlID="btnPopup" BackgroundCssClass="modalPopupBG">
</ajaxToolkit:ModalPopupExtender>
<asp:Panel CssClass="whitebubble" ID="Panel1" style="display: none; max-width:400px;" runat="server">
<div style="padding:5px 5px 35px 5px;">
<asp:Label ID="lblMessage" Font-Size="Medium" runat="server" ForeColor="Black"/>
<br />
<asp:Button runat="server" Text="Ok" Width="75px" Height="30px" ID="btnOkay" CssClass="modalButton gray modalButton"/>
</div>
</asp:Panel>
The control code behind:
public void ShowMessage(string message)
{
this.lblMessage.Text = message;
ModalMessageExtender.Show();
}
My content page:
<%# Register Src="~/ModalMessage.ascx" TagName="ModalMessage" TagPrefix="mm" %>
<mm:ModalMessage runat="server" ID="mpeMessage"/>
My content code behind:
mpeMessage.ShowMessage("Please enter a username before attempting to reset your password.");
UPDATE:
Sorry for the lack of clarity - let me make my question more clear. If I do the following:
mpeMessage.ShowMessage("Please enter a username before attempting to reset your password.");
Response.Redirect("Register.aspx");
The redirect occurs and the ModalPopupExtender never gets shown. I'm somewhat new to web development so please forgive me if I'm using incorrect terminology. But essentially, I want the execution of code in the code behinds to wait for the user to click "Ok". I'm trying to replace something like this:
ScriptManager.RegisterStartupScript(this, typeof(string), "Message", "alert('Your new account has been created!'); window.location='" + continueUrl + "';", true);
With something a little nicer looking, and since I'm already doing a postback anyway, I thought calling the ModalPopupExtender programmatically would be fine. Hopefully this clears up my question. Thank you all for your responses so far.

You can use validation controls , to check whether the fields are properly filled or not
for more details check the following links:
http://www.w3schools.com/aspnet/aspnet_refvalidationcontrols.asp
http://msdn.microsoft.com/en-us/library/aa479013.aspx

If i am understanding your query correctly then you want that until user does not click on "ok" button on modelpopup, user should not be able to click on page.
if you want this then add PopupDragHandleControlID="Panel1" in your modelpopup control.
<ajaxToolkit:ModalPopupExtender ID="ModalMessageExtender" runat="server"
OkControlID="btnOkay" PopupControlID="Panel1" PopupDragHandleControlID="Panel1"
TargetControlID="btnPopup" BackgroundCssClass="modalPopupBG">
</ajaxToolkit:ModalPopupExtender>
UPDATE
just replace Response.Redirect("Register.aspx"); to btnOkay click event.
on aspx page -
<asp:Button runat="server" Text="Ok" Width="75px" Height="30px" ID="btnOkay" OnClick="btnOkay_Click" CssClass="modalButton gray modalButton"/>
on aspx.cs page -
protected void btnOkay_Click(object sender, EventArgs e)
{
Response.Redirect("Register.aspx");
}
then until user will not click on "Ok" button. he/she can't redirect to Register Page.

Nullref Exc. on label detected by intellisense?

Okay so I'm quite new to ASP.NET and the MasterPage concept and there's an error I just can't figure out.
This is a part of my default.aspx:
<asp:Content ID="ContentLoginContent" ContentPlaceHolderID="LoginContentPlaceHolder" runat="server">
<div id="ContentLoginDiv">
You've got <asp:Label ID="MemberCreditLabel" runat="server" Text="0"></asp:Label> credits.
</div>
This is the relevant part of my default.aspx.cs:
public partial class _Default : System.Web.UI.Page
{
protected void Page_Init(object sender, EventArgs e)
{
}
protected void Page_Load(object sender, EventArgs e)
{
if (User.IsInRole("Authenticated"))
{
MemberCreditLabel.Text = "hello ";
}
}
}
I get a Nullref exception on MemberCreditLabel. It gets detected with intelliSense. I think the problem could be that the ContentPlaceHolder "ContentLoginContent" only shows when logged in. This is a part of my MasterPage:
<asp:LoginView ID="MemberLoginView" runat="server">
<AnonymousTemplate>
<asp:Login ID="LogInBox" runat="server" Height="137px" style="margin-left: 0px"
Width="16px">
</asp:Login>
</AnonymousTemplate>
<LoggedInTemplate>
Welcome <asp:LoginName ID="MemberLoginName" runat="server" /> !
<asp:LoginStatus ID="MemberLoginStatus" runat="server" />
<asp:ContentPlaceHolder ID="LoginContentPlaceHolder" runat="server">
//Is this the problem?
</asp:ContentPlaceHolder>
</LoggedInTemplate>
</asp:LoginView>
What I want to do is to show a credit amount stored in a database. The function for retreiving the data I want works. I take the user name of the currently logged in user and want to get the credit amount associated with the user. But this strange error with the label halts me completely.. It's probably got to do with a concept of MasterPages that I haven't stumbled across yet. Any ideas?

Apparently this is by design:
This is by design. The content control replaces the content of the contentplaceholder control which is inside a template. Thus the textbox actually gets instatiated in a template and thus needs to be looked up using FindControl - direct access will not be available.
Thanks,
The WebPlatform and Tools Team.
However, using a recursive FindControl, I wasn't able to actually get hold of the control inside the LoggedInTemplate - indeed in the markup of the Page, ReSharper was complaining that it couldn't resolve the symbol "LoginContentPlaceHolder" - i.e. it couldn't find the content placeholder correctly on the MasterPage.
Is there any way you could display the credits on all authenticated pages?
Or, you could wrap the LoginView with just a LoggedInTemplate containing the credit count into a usercontrol, and drop that inside the content placeholder.

ScriptManager.RegisterClientScript in a UserControl within a FormView inside an Async Panel

I'm having an annoying problem registering a javascript event from inside a user control within a formview in an Async panel. I go to my formview, and press a button to switch into insert mode. This doesn't do a full page postback. Within insert mode, my user control's page_load event should then register a javascript event using ScriptManager.RegisterStartupScript:
ScriptManager.RegisterStartupScript(base.Page, this.GetType(), ("dialogJavascript" + this.ID), "alert(\"Registered\");", true);
However when I look at my HTML source, the event isn't there. Hence the alert box is never shown. This is the setup of my actual aspx file:
<igmisc:WebAsyncRefreshPanel ID="WebAsyncRefreshPanel1" runat="server">
<asp:FormView ID="FormView1" runat="server" DataSourceID="odsCurrentIncident">
<EditItemTemplate>
<uc1:SearchSEDUsers ID="SearchSEDUsers1" runat="server" />
</EditItemTemplate>
<ItemTemplate>
Hello
<asp:Button ID="Button1" runat="server" CommandName="Edit" Text="Button" />
</ItemTemplate>
</asp:FormView>
</igmisc:WebAsyncRefreshPanel>
Does anyone have any idea what I might be missing here?

Have you tried using RegisterClientSideScript? You can always check the key for the script with IsClientSideScriptRegistered to ensure you don't register it multiple times.
I'm assuming the async panel is doing a partial page past back which doesn't trigger the mechansim to regenerate the startup scripts. Perhaps someone with a better understanding of the ASP.Net Page Life Cycle and the CLR can fill in those blanks.

For me that works fine. resizeChartMid() is a function name.
ScriptManager.RegisterStartupScript(this, typeof(string), "getchart48", "resizeChartMid();", true);

Try this, i got the same issue
ScriptManager.RegisterClientScriptBlock(MyBase.Page, Me.[GetType](),
("dialogJavascript" + this.ID), "alert(\"Registered\");", True)
This worked for me!