Display a message when radio button is not selected

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Hello,
This is my issue I have group of radion buttons and I want to when someone of them is not seleted to display error message. This is the code that I have

<pre><div class="floatLeft ml_15">
                                <asp:Literal ID="litPatientTypeO9" runat="server"></asp:Literal> *
                                <br />
                                <asp:RadioButton ID="rbtnNewO9" runat="server" GroupName="PatientTypeO9" CssClass="checkBox" />
                                <br />
                                <asp:RadioButton ID="rbtnRecidedO9" runat="server" GroupName="PatientTypeO9" CssClass="checkBox" />
                                <br />
                                <asp:RadioButton ID="rbtnUnsucessfulyTreatedO9" runat="server" GroupName="PatientTypeO9" CssClass="checkBox" />
                                <br />
                                <asp:RadioButton ID="rbtnTreatedAfterBrakeO9" runat="server" GroupName="PatientTypeO9" CssClass="checkBox" />
                                <br />
                                <asp:RadioButton ID="rbtnMovedO9" runat="server" GroupName="PatientTypeO9" CssClass="checkBox" />
                                <br />
                                <div id="divOtherType09" runat="server" class="floatLeft" style="padding-top: 3px;">
                                    <asp:RadioButton ID="rbtnOtherTypeO9" runat="server" 
                                        GroupName="PatientTypeO9" OnCheckedChanged="rbtnrbtnOtherTypeO9_CheckedChanged" AutoPostBack="true" CssClass="checkBox" />
                                </div>
                                <div class="floatLeft">
                                    <uc1:TextBoxControl ID="txtOtherTypeO9" runat="server" />
                                </div>
                            </div>

Thank you

What I have tried:

I look up trought internet, codeproject, stackoverfllow and msd forums and cannot find solution for me.

Posted 8-Apr-19 21:27pm

Member 12823969

Updated 9-Apr-19 1:02am

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Rohan Dhamecha · Answer 1 · 2019-04-09T01:03:00

Here instead of using all the radio buttons separately, it is appropriate to use the radio button list. Prepare a data table for the data you want to display and bind it with radio button list like following:

RadioButtonList1.DataSource = dt;
                RadioButtonList1.DataTextField = "shortCode";
                RadioButtonList1.DataValueField = "longName";
                RadioButtonList1.DataBind();

You can also give same column to both data text field and data value field.
So, the main use of radio button list is that you can check the selected index.

RadioButtonList1.SelectedIndex != -1

If it is not -1, then any of radio button is selected else none is selected.