This tutorial shows how you can validate the input of users using ASP.NET and C#
This tutorial shows how the ASP.NET tools make it easy for you to validate user input, both client-side and server-side.
First we add the form elements from the Toolbox, including the RequiredFieldValidator, RegularExpressionValidator and the ValidationSummary.
Note the CustomValidator control, which allows us to create a custom rule for validation. This particular one checks to see if a date is in the correct format:
| <form id="form1" runat="server"> <div> <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="textEmail" Display="Dynamic" ErrorMessage="Email Address is Required" ValidationGroup="AllValidators">*</asp:RequiredFieldValidator> </div>Email: <asp:TextBox ID="textEmail" runat="server"></asp:TextBox> <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="textEmail" Display="Dynamic" ErrorMessage="Email Address must be in the format abc@xyz.abc" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ValidationGroup="AllValidators">Invalid Format</asp:RegularExpressionValidator><br /> <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="textNumberInParty" ErrorMessage="Number in Party is Required" ValidationGroup="AllValidators">*</asp:RequiredFieldValidator> Number in Party: <asp:TextBox ID="textNumberInParty" runat="server" Width="45px"></asp:TextBox> <asp:RangeValidator ID="RangeValidator1" runat="server" ControlToValidate="textNumberInParty" Display="Dynamic" ErrorMessage="Please enter 1-20 for the number of people in your party" MaximumValue="20" MinimumValue="1" Type="Integer" ValidationGroup="AllValidators">Enter a number between 1 and 20</asp:RangeValidator><br /> <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="textPreferredDate" Display="Dynamic" ErrorMessage="Date is Required" ValidationGroup="AllValidators">*</asp:RequiredFieldValidator> Preferred Date: <asp:TextBox ID="textPreferredDate" runat="server"></asp:TextBox> <asp:CustomValidator ID="CustomValidator1" runat="server" ControlToValidate="textPreferredDate" Display="Dynamic" ErrorMessage="Format: m/d/yyyy" OnServerValidate="CustomValidator1_ServerValidate" ValidationGroup="AllValidators" ClientValidationFunction="validateDate">Invalid format (m/d/yyyy)</asp:CustomValidator><br /> <asp:RequiredFieldValidator ID="validatorRequiredPhoneNumber" runat="server" ControlToValidate="textPhoneNumber" Display="Dynamic" ErrorMessage="You must provide a phone number">*</asp:RequiredFieldValidator> <asp:CheckBox ID="checkPhoneConfirmation" runat="server" AutoPostBack="True" OnCheckedChanged="checkPhoneConfirmation_CheckedChanged" Text="Confirm Reservation by Phone" /><br /> Tel. No. <asp:TextBox ID="textPhoneNumber" runat="server" Enabled="False"></asp:TextBox> <asp:RegularExpressionValidator ID="validatorRegExPhoneNumber" runat="server" ControlToValidate="textPhoneNumber" Display="Dynamic" ErrorMessage="Phone number format is invalid" ValidationExpression="((\(\d{3}\) ?)|(\d{3}-))?\d{3}-\d{4}">Invalid Format</asp:RegularExpressionValidator><br /> <asp:Button ID="buttonSubmit" runat="server" OnClick="buttonSubmit_Click" Text="Submit" ValidationGroup="AllValidators" /><br /> <asp:Label ID="labelResponse" runat="server"></asp:Label><br /> <asp:ValidationSummary ID="ValidationSummary1" runat="server" ValidationGroup="AllValidators" /> </form> |
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In the code-behind file we have the following:| protected void Page_Load(object sender, EventArgs e) { labelResponse.Text = ""; }protected void buttonSubmit_Click(object sender, EventArgs e) { if (Page.IsValid) }{ labelResponse.Text = "Your request has been processed. Thank you."; }else { labelResponse.Text = "Date is not valid."; }protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args) { try } protected void checkPhoneConfirmation_CheckedChanged(object sender, EventArgs e){ DateTime.ParseExact(args.Value, "d", null); }args.IsValid = true; catch { args.IsValid = false; }{ if(checkPhoneConfirmation.Checked) { } textPhoneNumber.Enabled = true; }validatorRequiredPhoneNumber.ValidationGroup = "AllValidators"; validatorRegExPhoneNumber.ValidationGroup = "AllValidators"; else { textPhoneNumber.Enabled = false; }validatorRequiredPhoneNumber.ValidationGroup = ""; validatorRegExPhoneNumber.ValidationGroup = ""; |
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For client-side validation of the date field, we can use a bit of JavaScript:Note: For this to work, the 'EnableClientScript' Property of the CustomValidator has to be set to True.
| <script language="javascript"> function validateDate(oSrc, args) { var iDay, iMonth, iYear; } </script> var arrValues; arrValues = args.Value.split("/"); iMonth = arrValues[0]; iDay = arrValues[1]; iYear = arrValues[2]; var testDate = new Date(iYear, iMonth - 1, iDay); if ((testDate.getDate() != iDay) || (testDate.getMonth() != iMonth - 1) || { (testDate.getFullYear() != iYear)) args.IsValid = false; }return; return true; |
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