VS2012实现简单登录界面

本文实例为大家分享了vs2012实现登录界面的具体代码，供大家参考，具体内容如下

这个是第一个界面的代码：

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;
using system.data.sqlclient;

namespace 登录x
{
  public partial class form1 : form
  {
    public form1()
    {
      initializecomponent();
    }

    private void userinfobindingnavigatorsaveitem_click(object sender, eventargs e)
    {
      this.validate();
      this.userinfobindingsource.endedit();
      this.tableadaptermanager.updateall(this.studentrecorddataset);

    }

    private void form1_load(object sender, eventargs e)
    {
      // todo: 这行代码将数据加载到表“studentrecorddataset1.userinfo”中。您可以根据需要移动或删除它。
      this.userinfotableadapter1.fill(this.studentrecorddataset1.userinfo);
      // todo: 这行代码将数据加载到表“studentrecorddataset.userinfo”中。您可以根据需要移动或删除它。
      this.userinfotableadapter.fill(this.studentrecorddataset.userinfo);

    }

    private void passwordlabel_click(object sender, eventargs e)
    {

    }

    private void button1_click(object sender, eventargs e)
    {
      string connstring = @"data source=.;initial catalog=studentrecord;integrated security=true";
      sqlconnection conn = new sqlconnection(connstring);
      string sql = "select count(*) from userinfo where username='" + usernamecombobox.text + "'and password='" + passwordtextbox.text + "'";
      conn.open();
      sqlcommand comm = new sqlcommand(sql, conn);
      int num = (int)comm.executescalar();
      if (num > 0)
      {
        form2 frm2 = new form2();
        frm2.show();

      }
      else
      {
        messagebox.show("对不起，用户名和密码并不匹配！", "登陆失败");
      }
      conn.close();
    }

    private void usernamecombobox_selectedindexchanged(object sender, eventargs e)
    {

    }

    private void passwordtextbox_textchanged(object sender, eventargs e)
    {

    }
  }
}

这个是第二个界面的代码：

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.text;
using system.threading.tasks;
using system.windows.forms;

namespace 登录x
{
  public partial class form2 : form
  {
    public form2()
    {
      initializecomponent();
    }

    private void label1_click(object sender, eventargs e)
    {

    }
  }
}

运行结果如图：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。