小编Amo*_*mol的帖子

如何在asp.net中禁用或启用按钮？我想在点击后禁用按钮以防止双击.我想点击它后禁用我的登录按钮.

我的模特

    [DataType(DataType.Text)]
    [Display(Name = "Number of Employee")]
    public int NumberOfEmployee { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "CEO Birthday")]
    [DateRange(2)]
    public DateTime CEO_Birthday { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "Organisation Anniversary")]
    [DateRange(3)]
    public DateTime OrgAnniversary { get; set; }

我的观点

          <tr>
            <td style="border:0;">
                <div class="editor-label">
                    @Html.LabelFor(m => m.NumberOfEmployee)                            
                </div> 
            </td>
            <td style="border:0;">
                <div class="editor-field">
                    @Html.TextBoxFor(m => m.NumberOfEmployee)
                </div>
            </td>
        </tr>

        <tr>
            <td style="border:0;vertical-align:middle;">
                <div class="editor-label">
                    @Html.LabelFor(m => m.CEO_Birthday)                            
                </div> 
            </td>
            <td style="border:0;">
                <div class="editor-field">
                    @Html.TextBoxFor(m => m.CEO_Birthday, …

我有两个表Invitations和Users,既表包含一些电子邮件.

我要算那些存在于电子邮件,Invitation表格,但在不存在Users表

请帖

InvitationID    Email
-------------------------------------
    1           test@test.com
    2           someone@example.com
    3           test12@test.com

用户

UserName                  IsActive
-------------------------------------
test@test.com             InActive
sample12@sample.com       Active
test12@test.com           InActive

我试过这样的

SELECT  COUNT(*) FROM Invitations, Users                                     
where Invitations.Email <> Users.UserName

我想要这样

Count=1