if (txtSearch.Text == "" && cboSearch.SelectedIndex != 3)
{  MainFrm.str = "请填写需要搜索的信息";}
else
{   string sqlSurnameExist = String.Format("select count(*) from UserInfo where Uname like '{0}'", txtSearch.Text+'%');//姓氏存在性检测if(cboSearch.SelectedIndex==2){  SqlCommand comSurname = new SqlCommand(sqlSurnameExist, conCon);int Surname = (int)comSurname.ExecuteScalar();//记录查询结果if (Surname > 0)//若搜索结果存在
        {if (Surname > 1)//若搜索结果多个，则显示全部信息，调用窗体MulInformationFrm{  bool fo = true;//判断MulInformationFrm是否已经打开foreach (Form f in MainFrm.FormList)              {   if (f is MulInformationFrm){  f.Show();//显示MulInformationFrm窗体fo = false;}}if (fo)//如果MulInformationFrm未打开则打开
              {MulInformationFrm tp = new MulInformationFrm();tp.MdiParent = this.MdiParent;//将信息传递给MulInformationFrm窗体下的的Search字段 MulInformationFrm.Search = txtSearch.Text + '%';MainFrm.str = "显示全部搜索信息";MainFrm.FormList.Add(temp);this.Close();//关闭现有窗体tp.Show();//打开MulInformationFrm窗体}else{MainFrm.str = "您已打开此页面";}}else  //若搜索结果只有一个，则显示详细信息，调用窗体InformationFrm{    bool fom = true;//判断InformationFrm窗体是否打开foreach (Form f in MainFrm.FormList)               {if (f is InformationFrm)//如果已打开InformationFrm窗体
                  {f.Show();//显示InformationFrm窗体fo = false;}}if (fom){InformationFrm tp = new InformationFrm();tp.MdiParent = this.MdiParent;MainFrm.str = "搜寻结果只有一个";//将信息传递给InformationFrm窗体下的的typeString字段InformationFrm.typeString = txtSearch.Text+'%';MainFrm.FormList.Add(temp);this.Close();//关闭现有窗体tp.Show();//打开InformationFrm窗体
              }else{  MainFrm.str = "您已打开此页面";}}}else//若搜索结果没有，则状态栏显示该姓氏不存在{    txtSearch.Text = "";txtSearch.Focus();MainFrm.str = "该姓氏不存在！";}}