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Telerik control RasMaskedTextBox is not showing error message

I am using CustomValidator for Telerik RadMaskedTextbox.The problem is that if i don't put any value , it doesn't show errormessage.
<telerik:RadMaskedTextBox ID="RadMaskedTextBox3" runat="server"
Width="150"
Mask="(###) ###-#### ext. #####">
</telerik:RadMaskedTextBox>
<asp:CustomValidator ID="CustomValidator4" runat="server"
ErrorMessage="*"
Display="Dynamic"
CssClass="error1"
Enabled="false"
ToolTip="At least one Phone no: needs to be filled in."
ValidateEmptyText="true"
EnableClientScript="true"
OnServerValidate="CustomValidator_ServerValidate"
SetFocusOnError ="true"
ValidationGroup="CarrierBaseInformation1">
</asp:CustomValidator>

Here you are another example with a CustomValidator:
<asp:CustomValidator ID="CustomValidator1" runat="server"
ClientValidationFunction="CheckLength"
ErrorMessage="Phone\Fax numbers must be 7 or 9 digits"
ControlToValidate="txtTollFree">*</asp:CustomValidator>
<script>
function CheckLength(source, args)
{
if (args.Value.length == 10 || args.Value.length == 13)
{
args.IsValid = true;
}else{
args.IsValid = false;
}
}
</script>

Here is an example how to achieve your goal:
In the Web.config set
<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None"/>
In the aspx
<telerik:RadMaskedTextBox Mask="(###) ###-#### ext. #####" RenderMode="Lightweight" ID="RadMaskedTextBox1" runat="server" EmptyMessage="Enter username"></telerik:RadMaskedTextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" Text="*" ControlToValidate="RadMaskedTextBox1"></asp:RequiredFieldValidator>
<asp:Button ID="Button1" runat="server" Text="PostBack" />

Validation in webform

In my web form I have 2 field that should only accept number (the calculation result of their value should shown in the third field. The RegularValidation of those two fields works fine before user click submit button. but NOT after. How to handle it?
<asp:TextBox ID="TextBox1" runat="server" placeholder="Liter"></asp:TextBox><span style="color:red;font-weight:bold"> *</span>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="This is required" ForeColor="Red" ValidationGroup="test" ControlToValidate="TextBox1" Display="Dynamic"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" ControlToValidate="TextBox1" runat="server" ForeColor="red" ErrorMessage="Enter only numbers!" ValidationExpression="\d+" Display ="Dynamic"></asp:RegularExpressionValidator>
The submit button:
protected void btn_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
TextBox3.Text = ((Convert.ToInt32(TextBox1.Text) * 4.18 * Convert.ToInt32(TextBox2.Text)) / 3600).ToString();
double result = Convert.ToDouble(TextBox3.Text);
TextBox3.Text = String.Format("{0:0.00}", result);

you can write a function / method like this to pass the value of the TextBox
public static bool isNumeric(string val, System.Globalization.NumberStyles NumberStyle)
{
Int32 result;
return Int32.TryParse(val, NumberStyle,
System.Globalization.CultureInfo.CurrentCulture, out result);
}
Call and check the method for example passing the following
var _isNumeric2 = isNumeric("9.", System.Globalization.NumberStyles.Integer);
Replace the first paramtere with the TextBox3.Text value

All was needed is to add ValidationGroup="test" same as the field. The solution is:
<asp:TextBox ID="TextBox1" runat="server" placeholder="Liter"></asp:TextBox><span style="color:red;font-weight:bold"> *</span>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="This is required" ForeColor="Red" ValidationGroup="test" ControlToValidate="TextBox1" Display="Dynamic"></asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator2" ControlToValidate="TextBox1" runat="server" ForeColor="red" ErrorMessage="Enter only numbers!" ValidationExpression="\d+" ValidationGroup="test" Display ="Dynamic"></asp:RegularExpressionValidator>

Validation on a button click using RequiredFieldValidator

In the past, on button click events, I've validated without using RequiredFieldValidators. However, I thought I'd learn about them and implement them.
My old approach:
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (txtSubject.Text.Equals("") || txtEmail.Text.Equals("") || txtComments.Text.Equals(""))
{
lblMessage.Text = "Please check all fields have been entered.";
}
//else if ...further validation statements e.g. check lengths
}
However, using RequiredFieldValidators with the same example, am I correct in saying that I don't have to check again if (txtSubject.Text.Equals("") || txtEmail.Text.Equals("") || txtComments.Text.Equals("")) like below or is it good practice to do so?
protected void btnSubmit_Click(object sender, EventArgs e)
{
if (Page.IsValid)
{
//...further validation statements e.g. check lengths
try
{
SendMail();
}
catch (Exception)
{
}
}
}
If I should still include the line, it should go at the beginning of the if (Page.IsValid), right?
HTML code:
<p>Contact Form</p>
<p>
Your name:
<asp:RequiredFieldValidator ID="rfvName" runat="server" ErrorMessage="*"
ControlToValidate="txtName" ValidationGroup="save" /><br />
<asp:TextBox ID="txtName" runat="server" Width="250px" /><br />
Your email address:
<asp:RequiredFieldValidator ID="rfvEmail" runat="server" ErrorMessage="*"
ControlToValidate="txtEmail" ValidationGroup="save" /><br />
<asp:TextBox ID="txtEmail" runat="server" Width="250px" />
<asp:RegularExpressionValidator runat="server" ID="rfvEmail2"
SetFocusOnError="true" Text="Example: email#gmail.com" ControlToValidate="txtEmail"
ValidationExpression="\w+([-+.']\w+)*#\w+([-.]\w+)*\.\w+([-.]\w+)*" Display="Dynamic"
ValidationGroup="save" /><br />
Subject:
<asp:RequiredFieldValidator ID="rfvSubject" runat="server" ErrorMessage="*"
ControlToValidate="txtSubject" ValidationGroup="save" /><br />
<asp:TextBox ID="txtSubject" runat="server" Width="400px" /><br />
Comments:
<asp:RequiredFieldValidator ID="rfvComments" runat="server" ErrorMessage="*"
ControlToValidate="txtComments" ValidationGroup="save" /><br />
<asp:TextBox ID="txtComments" runat="server" TextMode="MultiLine" Rows="10" Width="400px" />
</p>
<p>
<asp:Button ID="btnSubmit" runat="server" Text="Send" OnClick="btnSubmit_Click" ValidationGroup="save" />
</p>
<p>
<asp:Label ID="lblMessage" runat="server" Visible="true" />
</p>

why dont you do the following?
Page.Validate("save");
if (Page.IsValid)
{
//Continue with your logic
}
else
{
//Display errors, hide controls, etc.
}
This only fires your validation group and furthermore , you can use a validation summary to display your message about the correct formats of the text boxes.
And you can display an error message then and there to display the correct format.

Validation issues in textbox in asp.net

I am designing a web-application using asp.net with c# and I just added a validation code for a textbox,it seems like it is good enough to execute,but no validation issues is been shown when the application is executed when input is null or invalid.
<asp:ValidationSummary ID="ValidationSummary1" runat="server"
ShowMessageBox="True" DisplayMode="BulletList"
HeaderText="Validation issues" ShowSummary="False" ValidationGroup="Validation"/>
<asp:TextBox ID="txtrandom" runat="server"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ErrorMessage="Enter the Randomly generated numbers"
ControlToValidate="txtrandom" Display="None"
ValidationGroup="Validation" SetFocusOnError="true" >
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator2"
runat="server" ErrorMessage="Input should be in number"
ValidationExpression="^[0-9]+$"
ControlToValidate="txtrandom"
Display="None"
ValidationGroup="Validation"
SetFocusOnError="true" >
</asp:RegularExpressionValidator>
In the backend(c#) I have these line of code
int random = 0;
bool isValidInt = int.TryParse(txtrandom.Text, out random);
for (int i = 0; i < random; i++)
{
//other codes
}
Does these lines of code effect the validation or just a syntactical error? Any help is appreciated.As far as i know he text box is taking 0 as a default value.

The problem is with the validation group . If you are not using the validation group everything will work but if you specified a validation group then the group has to be enabled in the button click event or something similar.
see my code . it is working fine.
<div>
<asp:ValidationSummary ID="ValidationSummary1" runat="server"
ShowMessageBox="True" DisplayMode="BulletList"
HeaderText="Validation issues" ShowSummary="false" ValidationGroup="one" />
<asp:TextBox ID="txtrandom" runat="server" ></asp:TextBox>
<asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ErrorMessage="Enter the Randomly generated numbers" Display="None"
ControlToValidate="txtrandom" ValidationGroup="one" >
</asp:RequiredFieldValidator>
<asp:RegularExpressionValidator ID="RegularExpressionValidator2"
runat="server" ErrorMessage="Input should be in number"
ValidationExpression="^[0-9]+$"
ControlToValidate="txtrandom"
Display="None"
ValidationGroup="one"
SetFocusOnError="true" >
</asp:RegularExpressionValidator>
<asp:Button ID="test" runat="server" Text="Submit" ValidationGroup="one" />
</div>
and yes validation group can be invoked on the post back.So error message wont display onfocouschange just like the normal validation.

Assign Validation group to textbox like this:
<asp:TextBox ID="txtrandom" runat="server" ValidationGroup="Validation"></asp:TextBox>

You can Try this Code, I am also using this code of numeric checking
bool isnum;
double numericval;
isnum = double.TryParse(numval, out numericval);
if (isnum)
{ return true; }
else { return false; }

How do I programmatically execute a link button within a FormView with a commandName in ASP.Net?

I have a the following linkbutton within an InsertItemTemplate in a FormView control:
<InsertItemTemplate>
<asp:Table runat="server" id="tabInst">
<asp:TableRow>
<asp:TableCell CssClass="PropertyLabel">Instrument ID:</asp:TableCell>
<asp:TableCell CssClass="PropertyValue">
<asp:TextBox id="tbID" runat="server" Text='<%# Eval("InstID")%>' MaxLength="20"/>
<asp:RequiredFieldValidator ID="reqValID" runat="server" ControlToValidate="tbID" CssClass="Validator" Display="Dynamic" ErrorMessage="Please enter an Instrument ID">*</asp:RequiredFieldValidator>
<asp:CustomValidator ID="compValID" runat="server" ControlToValidate="tbID" CssClass="Validator" Display="Dynamic" OnServerValidate="compValID_ServerValidate" ErrorMessage="That InstrumentID already exists">*</asp:CustomValidator>
</asp:TableCell><asp:TableCell CssClass="PropertyLabel">Instrument Name:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:TextBox id="tbName" runat="server" Text='<%# Eval("Name")%>' />
<asp:RequiredFieldValidator ID="reqValName" runat="server" ControlToValidate="tbName" CssClass="Validator" Display="Dynamic" ErrorMessage="Please enter an Instrument Name">*</asp:RequiredFieldValidator>
</asp:TableCell></asp:TableRow><asp:TableRow>
<asp:TableCell CssClass="PropertyLabel">Exchange Symbol:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:TextBox ID="tbExchSym" runat="server" Text=<%# Eval("ExchSymbol") %> MaxLength="20"></asp:TextBox>
</asp:TableCell><asp:TableCell CssClass="PropertyLabel">Instrument Type:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:DropDownList ID="ddInstType" runat="server" DataSourceID="edsInstType" DataTextField="Name" DataValueField="Code" SelectedValue=<%# Bind("InstType") %>></asp:DropDownList>
</asp:TableCell></asp:TableRow><asp:TableRow>
<asp:TableCell CssClass="PropertyLabel">Currency:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:DropDownList ID="ddCurr" runat="server" DataSourceID="edsCurr" DataTextField="Name" DataValueField="Code" OnInit="ddCurr_Init" SelectedValue=<%# Bind("CurrCode") %>></asp:DropDownList>
</asp:TableCell><asp:TableCell CssClass="PropertyLabel">Exchange:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:DropDownList ID="ddExch" runat="server" DataSourceID="edsExch" DataTextField="Name" DataValueField="Code" OnInit="ddExch_Init" SelectedValue=<%# Bind("ExchCode") %>></asp:DropDownList>
</asp:TableCell></asp:TableRow><asp:TableRow>
<asp:TableCell CssClass="PropertyLabel">Price Divisor:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:TextBox id="tbPriceDiv" runat="server" Text='<%# Eval("PriceDiv")%>' />
<asp:RequiredFieldValidator ID="reqValPriceDiv" runat="server" ControlToValidate="tbPriceDiv" CssClass="Validator" Display="Dynamic" ErrorMessage="Please enter a Price Divisor">*</asp:RequiredFieldValidator>
<asp:CompareValidator ID="compValPriceDiv" runat="server" ControlToValidate="tbPriceDiv" CssClass="Validator" Display="Dynamic" ErrorMessage="Price Divisor must be greater than 0" Operator="GreaterThan" ValueToCompare="0" Type="Integer">*</asp:CompareValidator>
</asp:TableCell><asp:TableCell CssClass="PropertyLabel">Tick Size:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:TextBox id="tbTickSize" runat="server" Text='<%# Eval("TickSize")%>' />
<asp:RequiredFieldValidator ID="reqValTickSize" runat="server" ControlToValidate="tbTickSize" CssClass="Validator" Display="Dynamic" ErrorMessage="Please enter a Tick Size">*</asp:RequiredFieldValidator>
<asp:CompareValidator ID="compValTickSize" runat="server" ControlToValidate="tbTickSize" CssClass="Validator" Display="Dynamic" ErrorMessage="Tick Size must be greater than 0" Operator="GreaterThan" ValueToCompare="0" Type="Double">*</asp:CompareValidator>
</asp:TableCell></asp:TableRow><asp:TableRow>
<asp:TableCell CssClass="PropertyLabel">Settle Day Type:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:RadioButtonList ID="rblSettType" runat="server" RepeatDirection="Horizontal" SelectedValue=<%# Bind("InstType") %>>
<asp:ListItem Selected="True" Text="Business" Value="B" />
<asp:ListItem Text="Calendar" Value="C" />
</asp:RadioButtonList>
</asp:TableCell><asp:TableCell CssClass="PropertyLabel">Settle Days:</asp:TableCell><asp:TableCell CssClass="PropertyValue">
<asp:TextBox ID="tbSettDays" runat="server" Text=<%# Eval("SettleDays") %>></asp:TextBox>
<asp:RequiredFieldValidator ID="reqValSettDays" runat="server" ControlToValidate="tbSettDays" CssClass="Validator" Display="Dynamic" ErrorMessage="Please enter a Settle Days">*</asp:RequiredFieldValidator>
<asp:CompareValidator ID="compValSettDays" runat="server" ControlToValidate="tbSettDays" CssClass="Validator" Display="Dynamic" ErrorMessage="Settle Days must be greater than or equal to 0" Operator="GreaterThanEqual" ValueToCompare="0" Type="Double">*</asp:CompareValidator>
</asp:TableCell></asp:TableRow></asp:Table><asp:EntityDataSource ID="edsCurr" runat="server" ConnectionString="name=CQPosManEntities" DefaultContainerName="CQPosManEntities" EnableFlattening="False" EntitySetName="Currencies">
</asp:EntityDataSource>
<asp:EntityDataSource ID="edsExch" runat="server" ConnectionString="name=CQPosManEntities" DefaultContainerName="CQPosManEntities" EnableFlattening="False" EntitySetName="Exchanges">
</asp:EntityDataSource>
<asp:EntityDataSource ID="edsInstType" runat="server" ConnectionString="name=CQPosManEntities" DefaultContainerName="CQPosManEntities" EnableFlattening="False" EntitySetName="InstTypes">
</asp:EntityDataSource>
<br />
<asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True" CommandName="Insert" Text="Insert" Visible="false" OnClick="InsertButton_Click"/>
<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False" CommandName="Cancel" Text="Cancel" Visible="false" />
<asp:ValidationSummary ID="valSum1" runat="server" CssClass="Validator" HeaderText="Please correct the following errors:" />
</InsertItemTemplate>
The code that calls the OnClick event is:
public bool Insert()
{
LinkButton lbInsert = (LinkButton) fvInst.FindControl("InsertButton");
InsertButton_Click(lbInsert, EventArgs.Empty);
}
I have confirmed that I have the correct button and that the InsertButton_Click function is entered. However, no validation is performed nor is the ItemInserting event fired which happens when the button is clicked physically.
Thanks.

you can move the code into a separate method and have that method called programatically. the onclick method for linkbutton can call that method as well.