Introduction: In this article I am going to share the following:
- How to check whether website address valid or not in asp.net
- How to allow only numbers i.e. numeric values or digits in textbox
- How to allow both number and decimal values in textbox
- How to validate date format e.g. dd/mm/yyyy in textbox
and What is page.isvalid and page.validate in asp.net and Validate,upload,cropand store image in folder in asp.net using jquery
Implementation: Let’s create a demo page to demonstrate the validation.
HTML Source Code
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<fieldset
style="width:300px;">
<legend>Validate using RegularExpressionValidator</legend>
<table>
<tr>
<td>Website:</td>
<td>
<asp:TextBox ID="txtWebsite" runat="server" Style="width: 200px" placeholder="e.g.
www.webcodeexpert.com"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="rgetxtWebsite" runat="server"
ControlToValidate="txtWebsite" ErrorMessage="Not a valid website URL" Display="Dynamic" ForeColor="Red" SetFocusOnError="true"
ValidationExpression="^((ftp|http|https):\/\/)?([a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+.*)$"></asp:RegularExpressionValidator></td>
</tr>
<tr>
<td>Pin Code:</td>
<td>
<asp:TextBox ID="txtPinCode" runat="server" Style="width: 200px"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="rgePinCode" runat="server"
ControlToValidate="txtPinCode" SetFocusOnError="True" ForeColor="Red" Display="Dynamic" ErrorMessage="Enter numbers only"
ValidationExpression="^[0-9]\d*$"></asp:RegularExpressionValidator></td>
</tr>
<tr>
<td>Price:</td>
<td>
<asp:TextBox ID="txtPrice" runat="server" Style="width: 200px"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="rgePrice" runat="server"
ControlToValidate="txtPrice" SetFocusOnError="True" ForeColor="Red" ErrorMessage="Only numeric or decimal numbers
are allowed" Display="Dynamic"
ValidationExpression="^[0-9]\d*(\.\d+)?$"></asp:RegularExpressionValidator></td>
</tr>
<tr>
<td>Order Date:</td>
<td>
<asp:TextBox ID="txtOrderDate" placeholder="dd/mm/yyyy" runat="server" Style="width: 200px"></asp:TextBox><br />
<asp:RegularExpressionValidator ID="rgeOrderDate" runat="server"
ControlToValidate="txtOrderDate" ErrorMessage="Not a valid date format" ForeColor="Red" SetFocusOnError="true" Display="Dynamic"
ValidationExpression="^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$"></asp:RegularExpressionValidator></td>
</table>
</fieldset>
</div>
</form>
</body>
</html>
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