Javascript 必填字段未验证asp.net中的“我的文本框”

我已经创建了一个用户控件并在其中使用了组验证，但我对组验证是新手，我知道必填字段是如何工作的，但在验证组中，我不能使用我自己的必填字段验证程序。有一些自定义验证器正在客户端使用javascript工作。请指导我如何使用自定义验证器、验证组和javascript组合使用js显示错误消息

<cc1:ModalPopupExtender ID="ModalPopupExtender2" Y="20" X="10" runat="server" TargetControlID="Button2"
    PopupControlID="pnlAddMoreOrEdit" BackgroundCssClass="ModalPoopup" BehaviorID="popup1"
    CancelControlID="modalCancel" PopupDragHandleControlID="EmptyPanel" RepositionMode="none">
</cc1:ModalPopupExtender>
 <%: System.Web.Optimization.Scripts.Render("~/Script/BusinessIncome44ADA")%>
<%--<script src="../../ITR_FY1617Assets/scripts/BusinessIncome44ADA.js" type="text/javascript"></script>--%>
<asp:Panel ID="pnlAddMoreOrEdit" runat="server" CssClass="ModalPopupPanel" Style="width: 900px;
    display: none">
    <div class="ModalHeader">
        <asp:Label ID="lblAdd" runat="server" CssClass="msg" Text="Business Income"></asp:Label>
        <asp:LinkButton ID="LinkButton1" runat="server" CssClass="HeaderButton CGHeaderImage"
            CausesValidation="false" OnClientClick="return Close();"  style="background-image:url('../../images/close_pop.png');" />
    </div>
    <div class="ModalBody">
        <div id="StepFive">
        </div>
        <div class="uspace">
            <asp:ValidationSummary runat="server" ID="ValidationSummary1" ForeColor="" CssClass="ValidationSummary"
                HeaderText=" Sorry, We need following information(s) to proceed further." ValidationGroup="G1">
            </asp:ValidationSummary>            
            <div id="Step1">
                <div class="Information">
                    <p>
                        Fill in the information of business income :
                    </p>
                </div>


                <p id="SubCatP" runat="server" style="display:none">
                    Suitable Area of Business 
                    <asp:DropDownList ID="ddlSubCatP" runat="server" CssClass="DropDownList" onchange="RemoveColour(this)">
                        <asp:ListItem Selected="True" Value="0">Select</asp:ListItem>
                        <asp:ListItem Value="0601">Legal</asp:ListItem>
                        <asp:ListItem Value="0602">Medical</asp:ListItem>
                        <asp:ListItem Value="0603">Engineering or Architectural</asp:ListItem>
                        <asp:ListItem Value="0604">Accountancy</asp:ListItem>
                        <asp:ListItem Value="0605">Technical</asp:ListItem>
                        <asp:ListItem Value="0606">Interior decoration</asp:ListItem>
                        <asp:ListItem Value="06071">Authorised Representative</asp:ListItem>
                        <asp:ListItem Value="06072">Film Artist </asp:ListItem>
                        <asp:ListItem Value="06073">Company Secretary</asp:ListItem>
                        <asp:ListItem Value="06074">Professional of Information Technology</asp:ListItem>

                        <asp:ListItem Value="06077">Others</asp:ListItem>
                    </asp:DropDownList>
                </p>

                <p class="RBLPara">
                    Name of Trade 
                    <asp:TextBox ID="txtNT" autocomplete="off" runat="server" MaxLength="100" CssClass="SimpleTextBox FloatRight IE6TextBox" onkeyup="RemoveColour(this)"/>
                </p>
            </div>
            <div id="Step2">

                <div id="ADDetails" style="display: none" runat="server">
                    <div class="Information">
                        <p>
                            Fill in the following information :
                        </p>
                    </div>
                    <p>
                        <span id="GrossTurnOver" runat="server">Gross Turnover / Receipts   
                        </span> 
                        <asp:TextBox ID="txtGTO" runat="server" autocomplete="off" onkeypress="return AllowNum(event);"  MaxLength="8" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;" CssClass="SimpleTextBox FloatRight IE6TextBox" onkeyup="checkGTO(this)" onblur="calProfit()"/>
                    </p>
                    <p id="Expense" runat="server" style="display:none">
                        Expenses
                        <asp:TextBox ID="txtExpenses" runat="server" autocomplete="off" onkeypress="return AllowNum(event);"  MaxLength="8" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;" CssClass="SimpleTextBox FloatRight IE6TextBox" onkeyup="checkGTO(this)" onblur="calProfit()"/>
                    </p>
                    <p>
                        <span id="NetProf" runat="server">Net Profit / Income
                        </span>
                        <asp:TextBox ID="txtIncome" runat="server" ValidationGroup="G3" autocomplete="off" onkeypress="return AllowNegNum(event);"  MaxLength="8" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;" CssClass="SimpleTextBox FloatRight IE6TextBox" onkeyup="checkGTO(this)" />
                    </p>
                </div>

                <div class="SundryDetails" id="SundryDetails" runat="server" style="display: none">
                    <p runat="server">
                        Sundry Debtors
                        <asp:TextBox ID="txtSD" autocomplete="off" runat="server" placeholder="If any" onkeypress="return AllowNum(event);"  MaxLength="8" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;" CssClass="SimpleTextBox FloatRight IE6TextBox" />
                    </p>
                    <p runat="server">
                        Sundry Creditors
                        <asp:TextBox ID="txtSC" autocomplete="off" runat="server" placeholder="If any" onkeypress="return AllowNum(event);" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;"  MaxLength="8" CssClass="SimpleTextBox FloatRight IE6TextBox" />
                    </p>
                    <p id="StockInTrade" runat="server">
                        Stock in Trade
                        <asp:TextBox ID="txtST" autocomplete="off" runat="server" placeholder="If any" onkeypress="return AllowNum(event);"  MaxLength="8" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;" CssClass="SimpleTextBox FloatRight IE6TextBox" />
                    </p>
                    <p runat="server">
                        Cash Balance
                        <asp:TextBox ID="txtCB" autocomplete="off" runat="server" placeholder="If any" onkeypress="return AllowNum(event);"  MaxLength="8" style="background-image: url('../../images/Rs_Symbol.png');
                            background-repeat:no-repeat;background-position: 5px;text-align: right;" CssClass="SimpleTextBox FloatRight IE6TextBox" />
                    </p>
                </div>
            </div>
            <div id="Step3" style="display:none">
               <div class="Information">
                    <p>
                        You are required to fill Books of accounts 
                    </p>
                </div>
            </div>

        </div>
    </div>
     <div class="ModalFooter" id="footer" runat="server">
          <a id="modalBack" class="modal" style="display: none" runat="server" causesvalidation="false"
            onclick="return GoBack();">Go Back</a> 

        <a id="modalCancel" class="modal" runat="server" onclick="return Close();">Cancel</a>
        <a id="modalSave" class="modal" runat="server" onserverclick="Save" onclick="return NextStep();">Next Step</a>
        <a id="modalTemp" class="modal" runat="server" style="display: none">Saving..</a>
        <div id="mycss" style="background-color: #f2f2f2;height:15px;display:none;margin-bottom:20px;">
    <a id="A1" class="modal" style="background-color: #5fb336;float:right;color:white;padding:10px;" runat="server"  href="BusinessIncomeBookOfAC.aspx">Continue to Books Of Accounts</a>
       </div>
    </div>
    <asp:Button ID="Button2" runat="server" Style="display: none" Text="Button" />
</asp:Panel>
<asp:Panel ID="EmptyPanel" runat="server">
</asp:Panel>
<asp:HiddenField ID="hfSteps" runat="server" Value="0" />
<asp:HiddenField ID="hfId" runat="server" Value="0" />
<asp:HiddenField ID="hfadmore" Value="1" runat="server" />
<asp:HiddenField ID="hfErrordiv" Value="0" runat="server" />
<asp:HiddenField ID="hfPan" runat="server" Value="" />


<asp:CustomValidator ID="CV1" runat="server" ValidationGroup="G1"
    ClientValidationFunction="Validate_FreeLance" ForeColor="White"
    ErrorMessage="Please Select Sub Category">*</asp:CustomValidator>



<asp:CustomValidator ID="CV2" runat="server" ValidationGroup="G2"
     ClientValidationFunction="Validate_Business" ForeColor="White"
    ErrorMessage="Please Select Suitable Area of Business.">*</asp:CustomValidator>

<asp:RequiredFieldValidator  runat="server" ControlToValidate="txtNT"
  ID="RequiredFieldValidator1" ValidationGroup="G1" ForeColor="White" ErrorMessage="Please Provide Name of Trade.">*</asp:RequiredFieldValidator>

<asp:RequiredFieldValidator  runat="server" ControlToValidate="txtIncome"
  ID="as" ValidationGroup="G3" ForeColor="White" ErrorMessage="Please Provide Name of Trade.">*</asp:RequiredFieldValidator>


<asp:RequiredFieldValidator ID="RequiredFieldValidator7" runat="server" ControlToValidate="txtGTO"
                ValidationGroup="G3" ForeColor="White" ErrorMessage="Please Provide Gross Turn Over." >*</asp:RequiredFieldValidator>

<asp:RequiredFieldValidator ID="a8" runat="server" ControlToValidate="txtIncome"
                ValidationGroup="G3" ForeColor="White" ErrorMessage="Please Provide Income.">*</asp:RequiredFieldValidator>
<%--<asp:CustomValidator ID="CustomValidator11" runat="server" ValidationGroup="G3"
     ClientValidationFunction="Validate_Income" ForeColor="red">*</asp:CustomValidator>--%>

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您还必须在按钮中提及ValidationGroup

     <asp:Button ID="Button2" runat="server" Style="display: none" Text="Button" ValidationGroup="G1"  />

例如，当您必须在“提交”按钮中验证某些内容时，请单击“将相同的组赋予您为“提交”指定的控件”