欢迎高手骚扰

错误为:无法将类型为“ASP.datainsert_checktool_aspx”的对象强制转换为类型“toolinsert3”。我的意图:由toolinsert3.aspx传值到checkTool.aspx
toolinsert3.aspx代码如下:
public partial class toolinsert3 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {    }
    public string gjmcText
    {
        get
        {
            return this.TextBox1 .Text ;
        }
        set
        {
            this.TextBox1 .Text  = value;
        }
    }    public string gjlxText
    {
        get
        {
            return this.DropDownList1 .SelectedItem .Text ;
        }
        set
        {
            this.DropDownList1.SelectedItem.Text = value;
        }
    }    public string gjxhText
    {
        get
        {
            return this.TextBox2.Text;
        }
        set
        {
            this.TextBox2.Text = value;
        }
    }
    public string jscsText
    {
        get
        {
            return this.TextBox3 .Text ;
        }
        set
        {
            this.TextBox3.Text = value;
        }
    }
    public string zyjgText
    {
        get
        {
            return this.TextBox4.Text;
        }
        set
        {
            this.TextBox4.Text = value;
        }
    }
    public string xnyqText
    {
        get
        {
            return this.TextBox5.Text;
        }
        set
        {
            this.TextBox5.Text = value;
        }
    }
    public string syfwText
    {
        get
        {
            return this.TextBox6.Text;
        }
        set
        {
            this.TextBox6.Text = value;
        }
    }
    public string gzylText
    {
        get
        {
            return this.TextBox7.Text;
        }
        set
        {
            this.TextBox7.Text= value;
        }
    }
    //public string tpText
    //{
    //    get
    //    {
    //        return FileUpload1.PostedFile .FileName ;
    //    }
    //}    protected void btntijiao_Click(object sender, EventArgs e)
    {
        if (TextBox1.Text != "" && DropDownList1.SelectedItem.Text != "" & TextBox2.Text != "" && TextBox3.Text != "" )
        {
            Server.Transfer("checkTool.aspx");
           
            //Server.Transfer("checkTool.aspx",true);                 }        else
        {
            Response.Write(" <script language=javascript>alert('前三项为必填项'); </script>");        } 
    }
checkTool.aspx代码如下:]public partial class dataInsert_checkTool : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
          //toolinsert3 queryPage = (toolinsert3)Context.Handler;            toolinsert3 queryPage = (toolinsert3)Context.Handler;这出错!            Labelgjmc.Text = queryPage.gjmcText;
            Labelgjlx.Text = queryPage.gjlxText;
            Labelgjxh.Text = queryPage.gjxhText;
            Labeljscs.Text = queryPage.jscsText;
            Labelzyjg.Text = queryPage.zyjgText;
            Labelxnyq.Text = queryPage.xnyqText;
            Labelsyfw.Text = queryPage.syfwText;
            Labelgzyl.Text = queryPage.gzylText;
            //Labelpicpath.Text = queryPage.tpText;
            //Image1.ImageUrl = "." + Labelpicpath.Text;
        }
        Button1.Attributes["onclick"] = "return confirm(' 你是否想入库');";
     
    }