How to add validation to Dropdown list whose values are dynamic i.e geting from database on page load?

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database

validation

C#5.0

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This is My Html File where i have used validation controls

ASP.NET

<table class="auto-style4">
                <tr>
                    <td class="auto-style11">
                        <asp:Label ID="lblName" runat="server" Text="Name" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style12">
                        <asp:TextBox ID="txtName" runat="server" Height="30px" Width="230px"></asp:TextBox>
                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtName" ErrorMessage="Please Enter a Name" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style11">
                        <asp:Label ID="lblMobile" runat="server" Text="Mobile" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style12">
                        <asp:TextBox ID="txtMobile" runat="server" Height="31px" Width="230px"></asp:TextBox>
                        <br />

                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server" ControlToValidate="txtMobile" ErrorMessage="Please Enter A Mobile No" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                        <br />
                        <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="txtMobile" ErrorMessage="RegularExpressionValidator" ForeColor="Red" ValidationExpression="^[789]\d{9}$" ValidationGroup="Reg"></asp:RegularExpressionValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style13">
                        <asp:Label ID="lblAddress" runat="server" Text="Address" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style14">
                        <asp:TextBox ID="txtAddress" runat="server" Height="31px" Width="230px" TextMode="MultiLine"></asp:TextBox>
                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtAddress" ErrorMessage="Please enter a Address" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style13">
                        <asp:Label ID="lblCity" runat="server" Text="City" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style14">
                        <asp:DropDownList ID="ddlCity" runat="server" Height="31px" Width="230px" AutoPostBack="True">
                        </asp:DropDownList>
                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ControlToValidate="ddlCity" ErrorMessage="Please Select One" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style13">
                        <asp:Label ID="lblGender" runat="server" Text="Gender" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style14">
                        <asp:RadioButtonList ID="rrbList" runat="server" Height="35px" Width="237px">
                            <asp:ListItem>Male</asp:ListItem>
                            <asp:ListItem>Female</asp:ListItem>
                        </asp:RadioButtonList>
                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ControlToValidate="rrbList" ErrorMessage="Please Select One" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style13">
                        <asp:Label ID="lblEmail" runat="server" Text="Email" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style14">
                        <asp:TextBox ID="txtEmail" runat="server" Height="31px" Width="230px"></asp:TextBox>
                        <br />
                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server" ControlToValidate="txtEmail" ErrorMessage="Please Enter An Email" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                        <br />
                        <asp:RegularExpressionValidator ID="RegularExpressionValidator2" runat="server" ControlToValidate="txtEmail" ErrorMessage="Please Enter A valid Email Address" ForeColor="Red" ValidationExpression="\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*" ValidationGroup="Reg"></asp:RegularExpressionValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style13">
                        <asp:Label ID="Label7" runat="server" Text="Date Of Birth" Style="font-size: x-large"></asp:Label>
                    </td>
                    <td class="auto-style14">
                        <asp:TextBox ID="txtDOB" runat="server" Height="31px" Width="230px"></asp:TextBox>
                    </td>
                    <td>
                        <asp:RequiredFieldValidator ID="RequiredFieldValidator6" runat="server" ControlToValidate="txtDOB" ErrorMessage="Please Enter Birth date in DD-MM-YY" ForeColor="Red" ValidationGroup="Reg"></asp:RequiredFieldValidator>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style13">
                        <asp:Button ID="btnSubmit" runat="server" Style="font-size: x-large" Text="Submit" OnClick="btnSubmit_Click" ValidationGroup="Reg" />
                    </td>
                    <td class="auto-style14">
                        <asp:Button ID="btnCancel" runat="server" Style="text-align: justify; font-size: x-large" Text="Cancel" />
                    </td>
                    <td>s</td>
                </tr>
            </table>

Posted 31-Dec-14 0:34am

Parth Mashroo

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Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Answer 1 · 2014-12-31T10:20:00

Solution 1

Get the data from database and bind to DropDownList. Then insert one default item at index 0 with value -1.

Code will be like...

ddlCity.Items.Insert(0, new ListItem("-1", "Select City");

Now add one property InitialValue="-1" to the validator to validate the dropdown.

Posted 31-Dec-14 10:20am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)