我在treeview控件上定义了两个radiobutton按钮一个为单位.一个为类型,现在当我单击单位后在单击类型,单位按钮的内容不刷新,而是把类型的内容叠加上去,点类型一样.要做的就是当我点单位就只出现单位的内容,点类型就只出类型的内容

最好是给代码,小弟才上,实在没有分给,对不住了,谢谢,助人为乐吗

public string tn1;


        private void radioButton1_CheckedChanged(object sender, EventArgs e)
        {
            try
            {
                TreeNode tn1 = treeView1.Nodes.Add("档案管理系统");
                string SQLstr = "SELECT DISTINCT ZZLBID,ZZLBName from ZZLBTable";// where ZZLBName = 1 ";//and sn in(" + all.Substring(0, all.Length - 1).ToString() + ")";
                SqlDataAdapter objAdapterNode = new SqlDataAdapter(SQLstr, My_con);
                DataSet My_DataSet = new DataSet();
                My_DataSet.Clear();
                objAdapterNode.Fill(My_DataSet, "temp");
                DataTable dt = My_DataSet.Tables["temp"];
                tn1.Nodes.Clear();

                //建立根节点，遍历。

                foreach (DataRow dr in dt.Rows)
                {
                    TreeNode Root = new TreeNode();
                    Root.Text = dr["ZZLBName"].ToString();
                    tn1.Nodes.Add(Root);
                    //TreeView1.Nodes.add(Root);//建立根节点


                    string str = "SELECT UnitID,ZZClass from ComeFile_Base ";//where UnitID = " + dr["ZZLBID"].ToString() + "' and ComeFile_Base in (" + ZZLBName.Substring(0, ZZLBName.Length - 1).ToString() + ")" + "order by ZZLBID，UnitID";
                    SqlDataAdapter objAdapter = new SqlDataAdapter(str, My_con);
                    DataSet dsNode = new DataSet();
                    dsNode.Clear();
                    objAdapter.Fill(dsNode, "tempNode");
                    DataTable dtNode = dsNode.Tables["tempNode"];

                    //建立子节点，遍历。

                    foreach (DataRow drNode in dtNode.Rows)
                    {
                        TreeNode Node = new TreeNode();
                        Node.Text = drNode["ZZClass"].ToString();
                        //Node.Target = "RightFrame";

                        string Path = drNode["UnitID"].ToString();
                        //int menusn = Convert.ToInt32(drNode["ZZClass"].ToString());
                        Node.Name = "Transfer.aspx" + "?ZZClass=" + Path;

                        Root.Nodes.Add(Node);//建立子节点
                    }
                }
            }
            catch (Exception edf)
            {
                MessageBox.Show(" 错误！('您没有可操作的菜单项！'); " + edf.Message);
            }


        }

        private void radioButton2_CheckedChanged(object sender, EventArgs e)
        {
            
            try
            {
                TreeNode tn1 = treeView1.Nodes.Add("档案管理系统");
                string SQLstr = "SELECT DISTINCT ZZLBID,ZZLBName from ZZLBTable";// where ZZLBName = 1 ";//and sn in(" + all.Substring(0, all.Length - 1).ToString() + ")";
                SqlDataAdapter objAdapterNode = new SqlDataAdapter(SQLstr, My_con);
                DataSet My_DataSet = new DataSet();
                My_DataSet.Clear();
                objAdapterNode.Fill(My_DataSet, "temp");
                DataTable dt = My_DataSet.Tables["temp"];
                tn1.Nodes.Clear();

                //建立根节点，遍历。

                foreach (DataRow dr in dt.Rows)
                {
                    TreeNode Root = new TreeNode();
                    Root.Text = dr["ZZLBName"].ToString();
                    tn1.Nodes.Add(Root);
                    //TreeView1.Nodes.add(Root);//建立根节点


                    string str = "SELECT UnitID,UnitName from ComeFile_Base ";//where UnitID = " + dr["ZZLBID"].ToString() + "' and ComeFile_Base in (" + ZZLBName.Substring(0, ZZLBName.Length - 1).ToString() + ")" + "order by ZZLBID，UnitID";
                    SqlDataAdapter objAdapter = new SqlDataAdapter(str, My_con);
                    DataSet dsNode = new DataSet();
                    dsNode.Clear();
                    objAdapter.Fill(dsNode, "tempNode");
                    DataTable dtNode = dsNode.Tables["tempNode"];

                    //建立子节点，遍历。

                    foreach (DataRow drNode in dtNode.Rows)
                    {
                        TreeNode Node = new TreeNode();
                        Node.Text = drNode["UnitName"].ToString();
                        //Node.Target = "mainbottom";

                        string Path = drNode["UnitID"].ToString();
                        //int menusn = Convert.ToInt32(drNode["ZZClass"].ToString());
                        Node.Name = "Transfer.aspx" + "?UnitName=" + Path;

                        Root.Nodes.Add(Node);//建立子节点



                    }
                }
            }
               
            catch (Exception edf)
            {
                MessageBox.Show(" 错误！('您没有可操作的菜单项！'); " + edf.Message);
            }

        }

大侠们,那么还是不行啊