如何使用require字段验证器来删除从sql数据集绑定的下拉列表.单击提交按钮时，我无法收到错误消息 [英] how to use require field validator for drop down which was bind from sql data set . i am not able to get the error message when i am clicking submit button

问题描述

我将下拉列表与数据集绑定，如下所示:

I bind drop down with Data set like this:

 ddlVendorname.DataSource = ds.Tables["Table1"];
ddlVendorname.DataTextField = "VENDOR_NAME";
ddlVendorname.DataValueField = "VENDOR_ID";
ddlVendorname.DataBind();
ddlVendorname.Items.Insert(0, "--Select--");

和我的Aspx和必填字段验证程序:

And My Aspx With Required Fields Validator:

<asp:DropDownList ID="ddlVendorname" runat="server" CssClass="dropdown185" AutoPostBack="True" OnSelectedIndexChanged="ddlVendorname_SelectedIndexChanged" AppendDataBoundItems="true">

                                
 <asp:RequiredFieldValidator ID="ReqVendorName" runat="server" ErrorMessage="Please Select Vendor Name" ControlToValidate="ddlVendorname" InitialValue="0" >

但是当我按下提交"按钮时，我无法收到错误消息.

But I am unable to get the error message when i am pressing the submit Button

<asp:ImageButton ID="imgbtnSave" runat="server" ImageUrl="~/Buttons/save-btn.png"
                                               AlternateText="Save" OnClick="imgbtnSave_Click" CausesValidation="true" />

PZ有人可以帮助我解决此问题...

PZ Some one help me to solve this...

推荐答案

在RequiredFieldValidator中将InitialValue ="0"替换为InitialValue =-Select--"
试试这个，我认为它应该起作用.

replace InitialValue="0" with InitialValue="--Select--" in RequiredFieldValidator
try this I think it should work.

使用 http://www.java2s.com/Code/ASP/Validation-by- Control/RequiredFieldValidatorforaspdropdownlistC.htm [ ^ ]

或使用CompareValidator

Use InitialValue[^]

Ref:http://www.java2s.com/Code/ASP/Validation-by-Control/RequiredFieldValidatorforaspdropdownlistC.htm[^]

Or use CompareValidator

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