C# 必填字段验证器允许提交空文本框

我有一个提交表单的两个文本框所需的字段验证器。我的表格代码如下。出于某种奇怪的原因，它不会验证并允许将空字符串输入数据库。正在输入的字段是char，但它不会将其提交为null，只是为空

前端

    <td style="width: 315px; height: 22px;border-right: solid 1px #a32020;">
                    <asp:TextBox ID="txtCompanyName" runat="server" BorderColor="#A32020" style ="border-right: solid 1px #a32020;" OnTextChanged="txtCompanyName_TextChanged" CausesValidation="True"></asp:TextBox>
                &nbsp;<asp:RequiredFieldValidator ID="rfvCoName" runat="server" ControlToValidate="txtCompanyName" Display="Dynamic" ErrorMessage="Please do not leave the Company Name blank." ValidationGroup="vgCompanyCreate"></asp:RequiredFieldValidator>
                </td>

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编辑：忽略插入连接字符串部分，实际的连接字符串与其他函数测试的一样工作正常

我设法找到了解决办法

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基本上，我发现所有相关字段也需要验证组。不仅仅是验证器

最好的方法是向codebhind.cs类添加代码

 protected void btnSubmitCompany_Click(object sender, EventArgs e)
    {
txtCompanyName.BorderColor = System.Drawing.Color.White;

if (txtCompanyName.Text="")
{
txtCompanyName.BorderColor = System.Drawing.Color.Red;
//Add error message if you want
}
else
{
if (Page.IsValid)
        {
            // Creating a new connection to the database. 
            -- Insert Connection String --

            // Creating a new command to insert the input values into the database.
            SqlCommand SubmitCompanyCmd = new SqlCommand("Insert into Employer ([EmployerID], [Name], [Status], [Remarks], [DateLastModified], [LastModifiedBy]) Values(@inputCoID, @inputCoName, @inputCoStatus, @inputCoRemarks, @currentDateTime, 'Admin')", conn);

            SubmitCompanyCmd.Parameters.AddWithValue("@inputCoID", txtCompanyID.Text);
            SubmitCompanyCmd.Parameters.AddWithValue("@inputCoName", txtCompanyName.Text);
            SubmitCompanyCmd.Parameters.AddWithValue("@inputCoStatus", ddlCompanyStatus.Text);
            SubmitCompanyCmd.Parameters.AddWithValue("@inputCoRemarks", txtCompanyRemarks.Text);
            SubmitCompanyCmd.Parameters.AddWithValue("@currentDateTime", DateTime.Now);

            conn.Open();
            SubmitCompanyCmd.ExecuteNonQuery();
            conn.Close();
            lblSuccessMsg.Text = "Yay. xqc";
}
}

或者您可以使用bootstrap required属性，这是非常基本的

<asp:TextBox ID="txtCompanyName" runat="server" BorderColor="#A32020" style ="border-right: solid 1px #a32020;" OnTextChanged="txtCompanyName_TextChanged"  requrired="true"></asp:TextBox>

<asp:TextBox ID="txtCompanyName" runat="server" BorderColor="#A32020" style ="border-right: solid 1px #a32020;" OnTextChanged="txtCompanyName_TextChanged"  requrired="true"></asp:TextBox>