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Range Validator showing error message but not preventing submit button click

This is my html code. I wonder why this range validator is not preventing the submit button click. any help will really be appreciated.
<asp:TextBox runat="server" class="form-control"
ID="AGE" ReadOnly="false" required="true" />
<asp:RangeValidator ID="RVAGE" runat="server" MinimumValue="1"
MaximumValue="110" ErrorMessage="Range 1-110 "
ControlToValidate="AGE" Display="Dynamic">
</asp:RangeValidator>
<asp:Button OnClientClick="return CheckDouble();"
CausesValidation="true" OnClick="submitclick"
ID="submitbtn" runat="server" Text="Submit" >
</asp:Button>

ValidationGroup fired after OnClick

I would like to do client-side validation to check if the textbox is empty before submit the form to server. However, the form is submit to server even though the textbox is empty.
<asp:Button ID="LinkButton2" runat="server" Text="Submit Order" CssClass="btn btn-lg btn-primary btn-block"
ValidationGroup="DeliveryAddVad" OnClick="SbmtOrder_Click" Width="150px" />
An error message will display under the textbox.
Is there anyway can stop the form submit to server if the textbox is empty.
The concern is OnClick="SbmtOrder_Click" will display a dialog, I do not want the dialog to show up if the textbox is empty.

You have to use a RequiredFieldValidator:
<asp:Button ID="LinkButton2" runat="server"
ValidationGroup="DeliveryAddVad"
UseSubmitBehavior="False"
Text="Submit Order"
CssClass="btn btn-lg btn-primary btn-block"
OnClick="SbmtOrder_Click"
Width="150px"
/>
<asp:RequiredFieldValidator runat="server" ID="reqOrder"
ValidationGroup="DeliveryAddVad"
controltovalidate="NameOfTextBox"
errormessage="Please enter [whatever the user has to enter]!"
/>
You can also try to set Button.UseSubmitBehavior to false (edited above) and the TextBox.CausesValidation to true(default false).

Execute server side code on ModalPopupExtender okcontrolid clicked

I am using ASP.NET and C#. I want to popup this little screen, then when the OK button is clicked, I want to update the main screen based on the input to the popup. Sounds like it should be a regular thing. Is it possible, and if so, how?
<cc1:modalpopupextender id="ModalPopupExtender1" runat="server"
cancelcontrolid="btnCancel" okcontrolid="btnOkay"
targetcontrolid="txtCosCodeExpCode" popupcontrolid="Panel1"
popupdraghandlecontrolid="PopupHeader" drag="true"
backgroundcssclass="ModalPopupBG">
</cc1:modalpopupextender>
<asp:panel id="Panel1" style="display: none" runat="server">
<div class="CostCentreExpenseCodePopup" style="background-color:White ; border-style :solid;">
<div class="PopupHeader" id="PopupHeader">Select Cost Centre / Expense Code</div>
<div class="PopupBody">
<p>Cost Centre<asp:DropDownList
ID="ddlCostCentres1"
runat="server"
CssClass="SVSComboBox1"
AppendDataBoundItems ="True"
AutoPostBack="True"
style = "width :152px;"
OnSelectedIndexChanged="ddlCostCentres1_SelectedIndexChanged">
<asp:ListItem Text="Please select" Value="0"></asp:ListItem>
</asp:DropDownList></p>
<p>Expense Code <asp:DropDownList ID="ddlExpCode1" runat="server" CssClass="SVSComboBox1" style = "width :152px;"
AppendDataBoundItems ="True" Enabled="False" Visible ="False">
<asp:ListItem Text="Please select" Value="0"></asp:ListItem>
</asp:DropDownList></p>
</div>
<div class="Controls">
<input id="btnOkay" type="button" value="Done" />
<input id="btnCancel" type="button" value="Cancel" />
</div>
</div>

Don't set OkControlID but use ModalPopupExtender1.Hide() on server-side. Then you're able to call your update-code first.
You should also use server-buttons instead of <input id="btnOkay" type="button" value="Done" /> and handle their click-event.

First of all add the asp:Button as an Ok button and add click event in your aspx.cs page as mentioned below:
ASPX:
<asp:Button runat="server" ID="btnOkay" Text="OK" OnClick="btnOkay_Click"/>
ASPX.cs
protected void btnOkay_Click(object sender, EventArgs e)
{
// Code to write on ok click event
}
And then remove okcontrolid="btnOkay" from your modal popup extender.

Is the Login control buggy?

From the documentation here http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.login.layouttemplate.aspx i had customized the user interface of login control through layout template like below
<LayoutTemplate>
<h3 class="login-title page-header">
<asp:Literal runat="server" ID="loginHeading" Text="Sign-in"></asp:Literal>
</h3>
<div class="clearfix">
<asp:Label runat="server" ID="lblUserName" Text="Username" AssociatedControlID="UserName"></asp:Label>
<div class="input">
<asp:TextBox runat="server" ID="UserName"></asp:TextBox>
<asp:RequiredFieldValidator runat="server" ID="rfvTxtUserName" ErrorMessage="Username is required"
ControlToValidate="UserName" Text="Username is required"></asp:RequiredFieldValidator>
</div>
</div>
<div class="clearfix">
<asp:Label runat="server" Text="Password" AssociatedControlID="Password"></asp:Label>
<div class="input">
<asp:TextBox runat="server" ID="Password" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator runat="server" ID="rfvTxtPassword" ErrorMessage="Password is required"
ControlToValidate="Password" Text="Password is required"></asp:RequiredFieldValidator>
</div>
</div>
<div class="clearfix">
<asp:Label runat="server" Text="Remember Me" AssociatedControlID="RememberMe"></asp:Label>
<div class="input">
<input type="checkbox" runat="server" id="RememberMe" />
</div>
</div>
<div class="actions action-fix">
<asp:Button runat="server" ID="Login" Text="Login" CssClass="btn success small" />
<input type="reset" class="btn small" value="reset" />
</div>
</LayoutTemplate>
as you can see i did name the control ID as required by the control. Also i use CSS Friendly control adapter for rendering the Login control.
The Problem
It just happens after user types username and password and submits the details nothing happens the page just reloads causing a postback.
What am i doing wrong here
info:
more problem seems to be more prominent for users using LoginControlAdapter look here http://forums.asp.net/t/1043974.aspx/2/10

you must be missing CommandName paramter
<asp:button id="Login" CommandName="Login" runat="server" Text="Login"></asp:button>

Try adding command name to your login button;
<asp:Button runat="server" ID="Login" Text="Login" CssClass="btn success small" CommandName="Login" />

check Validation of a cotrol from code behind - causing to show Validator Text

hi my dear friends :
i have a button with CausesValidation Property to false...
it's code like below :
<telerik:RadButton ID="RadbtnViewImage" runat="server" Text="view" CausesValidation="False" EnableEmbeddedSkins="False" Skin="BlackByMe" Font-Names="Tahoma" Width="80px" onclick="RadbtnViewImage_Click">
</telerik:RadButton>
also i have a RadComboBox with a CostumValidator that is in relationship with that RadComboBox...
it's code like below :
<div class="EditRow">
<div class="RightEditColumn">
imageGroupName
</div>
<div class="LeftEditColumn">
<telerik:RadComboBox ID="RadcbImageGroupInrpvEdit" runat="server" DataSourceID="sdsImagesGroup"
DataTextField="Title" DataValueField="ID" EnableEmbeddedSkins="False" Skin="BlackByMe2"
AppendDataBoundItems="True" MarkFirstMatch="True" LoadingMessage="loading...."
CausesValidation="False" ValidationGroup="B">
<Items>
<telerik:RadComboBoxItem runat="server" Text="plz select one" Value="0" />
</Items>
</telerik:RadComboBox>
</div>
<div class="ValDivInrpvEdit">
<div style="display: inline;">
<span id="spnOfcvImageGroupInrpvEdit" class="ttTarget">
<asp:CustomValidator ID="cvImageGroupInrpvEdit" runat="server" ControlToValidate="RadcbImageGroupInrpvEdit"
Display="Dynamic" ValidationGroup="B"
onservervalidate="cvImageGroupInrpvEdit_ServerValidate">
<span class="imgValContainerInrpvEdit">
<asp:Image ID="img4cvImageGroupInrpvEdit" CssClass="imgValidateInrpvEdit" runat="server" AlternateText="attention"
ImageUrl="~/Images/Exclamation.png" /></span>
</asp:CustomValidator>
</span>
<div id="tt44cvImageGroupInrpvEdit" class="ttContent">
plz choose
</div>
</div>
</div>
</div>
when the button is clicked i just want to check only that RadCombobox Validation and show the CustomValidator Text of it to users / not the other validators !
how can i do that ?
(the other controls In my page plus that RadComboBox have a same ValidationGroup -> Mean "B")
thanks in advance

Attach a second validator for this scenario with its own distinct validation group. This way, you can fire this one validator for this specific scenario, and use the original validator to validate when the entire form is processed. Depending on how you need to validate, you can use Required (set InitialValue to the initial value of the combo), or Custom.
HTH.