how to set RequiredFieldValidator to validate against specific user control which has multiple instance?

Question

so let say i have a user control which called 7 times in an aspx file, i put field validator control in that user control, the problem is everytime i click some buttons which cause postback, field validator always validate controls against all instances of my user control, what i want is to validate against specific user control, i have tried this :

<asp:TextBox runat="server" ID="DateNew" CssClass="time" Width="185px"/>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Date can not be empty" ControlToValidate="DateNew" ValidationGroup='<%= ClientID %>' Text="*"> </asp:RequiredFieldValidator> 
 <asp:Button runat="server" ID="NewSchedule" Text="Schedule" CssClass="bgrey" 
        OnClientClick="CheckKeyValues()" OnClick="NewSchedule_Click"  ValidationGroup='<%= ClientId %>'/>

this is not working... any correction? thanx before. btw some example would be great.

update : aspx file with a user control called 7 times

 <asp:ScriptManager id="ScriptManager1" runat="server">
                        </asp:ScriptManager>
                        <div id="divError" class="n fail" style="display:none; margin:15px; width:2330px">
                             <h5>
                                The following errors were found
                             </h5>
                             <asp:ValidationSummary ID="ValidationSummary" runat="server" />
                        </div>    
                        <div class="warea clearfix" style="width: 2350px">
                            <div style="float:left;">
                                <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress" TestType="Interview 1" />
                            </div>
                             <div style="float:left;">
                                <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress1" TestType="Interview 2"/>
                            </div>
                             <div style="float:left;">
                               <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress2" TestType="Interview 3"/>
                            </div>
                             <div style="float:left;">
                                <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress3" TestType="English Test"/>
                            </div>
                             <div style="float:left;">
                                <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress4" TestType="Medical Examination"/>
                            </div>
                             <div style="float:left;">
                                <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress5" TestType="Internal Psycho Test"/>
                            </div>
                             <div style="float:left;">
                                <uc1:ucApplicationProgress runat="server" id="ucApplicationProgress6" TestType="External Psycho Test"/>
                            </div>
                        </div>

user control file :

 <h3><asp:Label runat="server" ID="TypeNew"/></h3>
              <table>
                  <tr>
                     <td>Date</td>
                     <td>
                         <asp:TextBox runat="server" ID="DateNew" CssClass="time" Width="185px"/>
                         <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Date can not be empty" ControlToValidate="DateNew">*</asp:RequiredFieldValidator>
                     </td>
                  </tr>
                  <tr>
                      <td>Time</td>
                      <td>
                          <asp:TextBox runat="server" ID="HourNew"  Width="40px"/> 
                          <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ErrorMessage="Time can not be empty" ControlToValidate="HourNew" Text="*">
                          </asp:RequiredFieldValidator>:  
                          <asp:TextBox runat="server" ID="MinuteNew"  Width="40px"/>
                          <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server" ErrorMessage="Minute can not be empty" ControlToValidate="MinuteNew" Text="*">
                          </asp:RequiredFieldValidator>
                      </td>
                  </tr>
                  <tr>
                      <td>Location</td>
                      <td>
                          <asp:TextBox runat="server" ID="LocationNew" TextMode="MultiLine"/>
                          <asp:RequiredFieldValidator ID="RequiredFieldValidator4" runat="server" ErrorMessage="Location can not be empty" ControlToValidate="LocationNew" Text="*">
                          </asp:RequiredFieldValidator>
                      </td>
                  </tr>
                  <tr>
                      <td>Interviewer</td>
                      <td>
                          <asp:TextBox runat="server" ID="InterviewerNew" autocomplete="off" onchange="MarkFlag(this.id)"/>
                          <asp:RequiredFieldValidator ID="RequiredFieldValidator5" runat="server" ErrorMessage="Interviewer can not be empty" ControlToValidate="InterviewerNew" Text="*">
                          </asp:RequiredFieldValidator>
                          <asp:HiddenField runat="server" ID="InterviewerKeys"/>
                          <asp:HiddenField runat="server" ID="InterviewerEmail"/>    
                      </td>
                  </tr>
                  <tr>
                      <td>&nbsp;</td>
                      <td><asp:Button runat="server" ID="NewSchedule" Text="Schedule" CssClass="bgrey" OnClientClick="CheckKeyValues()" OnClick="NewSchedule_Click" /></td>
                  </tr>
              </table>

C# :

 public String ValidationGroup
        {
            get 
            { 
                return RequiredFieldValidator1.ValidationGroup;
            }
            set
            {
                RequiredFieldValidator1.ValidationGroup = value;
                RequiredFieldValidator2.ValidationGroup = value;
                RequiredFieldValidator3.ValidationGroup = value;
                RequiredFieldValidator4.ValidationGroup = value;
                RequiredFieldValidator5.ValidationGroup = value;
                NewSchedule.ValidationGroup = value;
            }
        }


  protected void Page_Load(object sender, EventArgs e)
        {

                ValidationGroup = this.ID;
        }

Answer 1

Expose a property on your Web User Control named ValidationGroup:

public String ValidationGroup
{
    get { return RequiredFieldValidator1.ValidationGroup; }
    set { 
        RequiredFieldValidator1.ValidationGroup = value; 
        NewSchedule.ValidationGroup = value; 
    }
}

Then set it to a unique value for each instance you create on your web form.

Answer 2

Give the validation group value anything like "Name" as i have given. And add the same validation group to both controls on which validation is to be fired and the control whose post back should fir validation.

     <asp:TextBox ID="TextBox1" runat="server" ValidationGroup="Name"></asp:TextBox>
    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" 
        ErrorMessage="Field value is required" ControlToValidate="TextBox1" 
        ValidationGroup="Name"></asp:RequiredFieldValidator>
    <asp:Button ID="Button1" runat="server" Text="Button" ValidationGroup="Name" />
    <asp:Button ID="Button2" runat="server" Text="Button" />

As in this case TextBox1 validation fires only when Button1 is clicked not on Button2 click event.