为什么在ASP中单击登录按钮时文本框大小会发生变化

Question

这是我的.aspx代码：-

        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>

                <asp:Panel ID="Panel1" runat="server" BorderColor="White" BorderStyle="Outset" CssClass="auto-style3" Height="410px" Width="337px">
                    <form>
                        <table class="auto-style4">
                            <tr>
                                <td class="auto-style5">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    <asp:Label ID="Label1" runat="server" Font-Bold="True" ForeColor="White" Font-Size="X-Large" Text="LOGIN"></asp:Label>
                                </td>
                            </tr>
                            <tr>
                                <td class="auto-style6"></td>
                            </tr>
                            <tr>
                                <td class="auto-style12">
                                    <asp:TextBox ID="txtusername" runat="server" CssClass="auto-style7" Height="32px" placeholder="Username" Width="308px"></asp:TextBox>
                                </td>
                            </tr>
                            <tr>
                                <td class="auto-style9">&nbsp;&nbsp;&nbsp;
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ControlToValidate="txtusername" ErrorMessage="*Required" ForeColor="Red"></asp:RequiredFieldValidator>
                                </td>
                            </tr>
                            <tr>
                                <td class="auto-style13">
                                    <asp:TextBox ID="txtpass1" runat="server" CssClass="auto-style7" Height="32px" placeholder="Password" Style="margin-left: 19" TextMode="Password" Width="308px"></asp:TextBox>
                                </td>
                            </tr>
                            <tr>
                                <td class="auto-style14">&nbsp;&nbsp;&nbsp;&nbsp;
                    <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server" ControlToValidate="txtpass1" ErrorMessage="*Required" ForeColor="Red"></asp:RequiredFieldValidator>
                                    <br />
                                    &nbsp;&nbsp;&nbsp;
                    <asp:CheckBox ID="CheckBox1" runat="server" AutoPostBack="True" Text="show password" ForeColor="White" OnCheckedChanged="CheckBox1_CheckedChanged" />
                                </td>
                            </tr>
                            <tr>
                                <td class="auto-style15">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    <asp:Button ID="Button1" runat="server" Class="btn btn-primary" Text="Login" Width="149px" OnClick="Button1_Click" />
                                </td>
                            </tr>
                            <tr>
                                <td>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    <asp:HyperLink ID="HyperLink8" runat="server" ForeColor="White" NavigateUrl="~/forgotpass.aspx">Forgot Password?</asp:HyperLink>
                                    <br />
                                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                    <asp:HyperLink ID="HyperLink7" runat="server" ForeColor="White" NavigateUrl="~/register2.aspx">New user? Register here.</asp:HyperLink>
                                </td>
                            </tr>
                            <tr>
                                <td class="auto-style11"></td>
                            </tr>
                        </table>
                    </form>
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>

这是C＃代码：

受保护的无效Button1_Click（对象发送者，EventArgs e）     {         使用（SqlConnection con = new SqlConnection（@“ Data Source =。\ SQLEXPRESS; AttachDbFilename = C：\ Program Files \ Microsoft SQL Server \ MSSQL11.SQLEXPRESS \ MSSQL \ DATA \ MASTER_DATABASE.mdf; Integrated Security = True; Connect Timeout = 30 “））         {             con.Open（）;             字符串查询=“从MST_Login_Mast中选择*，其中User_Login_name = @ User_Login_name和User_Password = @ User_Password”；             SqlCommand cmd =新的SqlCommand（query，con）;             cmd.Parameters.AddWithValue（“ @ User_Login_name”，txtusername.Text.Trim（））;             cmd.Parameters.AddWithValue（“ @ User_Password”，txtpass1.Text.Trim（））;             // int count = Convert.ToInt32（cmd.ExecuteScalar（））;             SqlDataReader dr = cmd.ExecuteReader（）;

        if (dr.Read())
        {
            con.Close();
            con.Open();
            SqlCommand cmd1 = new SqlCommand("select count(*) from MST_Login_Mast where Tran_Lock != 'N' and User_Login_name='" + txtusername.Text.Trim() + "' and User_Password='" + txtpass1.Text.Trim() + "'", con);
            int count = int.Parse(cmd1.ExecuteScalar().ToString());
            //SqlDataReader dr1 = cmd1.ExecuteReader();
            if (count > 0)
            {
                Response.Write("<script language=javascript>alert('Sorry!!!... You Are Locked For Any Transaction!!!...')</script>");

                txtusername.Text = "";
                txtpass1.Text = "";


            }
            else
            {
                Session["User_Login_name"] = txtusername.Text.Trim();
                Response.Write("<script language=javascript>alert('Login Successfull')</script>");
                Response.Redirect("Home.aspx");
                Session.RemoveAll();
            }
        }
        else
        {

            Response.Write("<script language=javascript>alert('sorry!! You are unauthorized person..Please register first')</script>");

        }
        con.Close();

        txtusername.Text = "";
        txtpass1.Text = "";

    }
}