判断asp:TextBox控件 提交Button1_Click提示不可为空数据操作，求讲解，最好是用、后台代码

Question

WEB页面内完全都是控件希望通过后台代码实现这个功能
拖入几个控件
<table style="width:97%; height: 4px;">
                            <tr>
                                <td class="style8">
                                    名称：</td>
                                <td class="style16">
                                    <asp:TextBox ID="TextBox1" runat="server" Width="148px"></asp:TextBox>
                                </td>
                                <td class="style14">
                                    <asp:Button ID="Button1" runat="server" height="21px" onclick="Button1_Click" 
                                        style="margin-left: 0px" Text="添    加" width="78px" />
                                    &nbsp;&nbsp;<asp:Button ID="Button7" runat="server" height="21px" onclick="Button7_Click" 
                                        Text="数据导出" width="78px" />
                                </td>
                            </tr>
                            <tr>
                                <td class="style4">
                                    <asp:Label ID="Label2" runat="server" Text="编号：" Visible="False"></asp:Label>
                                </td>
                                <td class="style17">
                                    <asp:TextBox ID="TextBox2" runat="server" Enabled="False" Visible="False" 
                                        ontextchanged="TextBox2_TextChanged"></asp:TextBox>
                                </td>
                                <td class="style15">
                                    <asp:Button ID="Button6" runat="server" height="21px" onclick="Button6_Click1" 
                                        Text="保存编辑" Visible="False" width="78px" />
                                    &nbsp;
                                    <asp:Button ID="Button5" runat="server" height="21px" onclick="Button5_Click1" 
                                        Text="取消修改" Visible="False" width="78px" />
                                </td>
                            </tr>
                        </table>通过后台代码实现 点击添加 判断 TextBox1与TextBox2中数据都不为空 如果为空提示
希望能附带上讲解 刚刚介入ASP.NET项目开发 

Answer 1

if(string.IsNullOrEmpty(TextBox1.Text)||string.IsNullOrEmpty(TextBox2.Text))
{Response.Write("不能为空");
}
else
{
执行正确操作
}

Answer 2

if(this.TextBox1.Text.Trim()!="")
{
     //
}
else
{
     //
}

Answer 3

if(string.IsNullOrEmpty(TextBox1.Text)||string.IsNullOrEmpty(TextBox2.Text))
{Response.Write("不能为空");
return;
}
else
{
执行正确操作
}

Answer 4

if (TextBox1.Text.ToString() == "")
{
Page.ClientScript.RegisterStartupScript(GetType(), "sf", "<script language='javascript'>alert('系统提示：\\n姓名不能空！');document.all('TextBox1').focus()</script>");
}
else
{
//执行代码...
}

Answer 5

document.all('TextBox1').focus() 这种写法 怎么才能判断2个TextBox 写同时判断

Answer 6

我刚刚改了改代码 给您看看         protected void Button1_Click(object sender, EventArgs e)
        {            if(string.IsNullOrEmpty(TextBox1.Text))
              {                  Page.ClientScript.RegisterStartupScript(GetType(), "message", "<script language='javascript'>alert('系统提示：\\n添加名称不能空！');document.all('TextBox1').focus()</script>");
                  return;
              }            if (string.IsNullOrEmpty(TextBox2.Text))
            {                Page.ClientScript.RegisterStartupScript(GetType(), "message", "<script language='javascript'>alert('系统提示：\\n添加编号不能空！');document.all('TextBox2').focus()</script>");
                return;            }
              else
              {
                  NewMethod();
              }      
        }        private void NewMethod()
        {
            CTWebPlatform.localhost.CTWebInterface mWebInt = new CTWebInterface();
            if (TextBox1.Text.Trim() != "")
            {
                mWebInt.AddMeasureStation(TextBox1.Text.Trim());
                GridView1.PageIndex = GridView1.PageCount;
                DataBinds();
            }
        }
        public void DataBinds( )
        {
            CTWebPlatform.localhost.CTWebInterface mWebInt = new CTWebInterface();
            DataTable BindData = mWebInt.SelMeasureStation();
            GridView1.DataSource = BindData.DefaultView;
            GridView1.DataBind();
                  }

Answer 7

我的前台页面是数据较多所以 很多JS代码 都会出现乱码 和大家分享一下 我刚刚写好的 试试这个 在后台写 很棒！ if (TextBox1.Text.ToString().Trim() == "")
            {
                Response.Write("<SCRIPT language=JavaScript>alert('不能为空！ ');");
                Response.Write("javascript:history.back(1)</SCRIPT>");
                Response.End();
                return;
            }
            else
            {
              //验证正确执行操作代码
                
            }