怎样隐藏动态生成的表格中的列

具体需求是这样的：

一个表格，表格中的textbox,label等控件都放置在一个htmltbale内，表格的一半是静态的，另一半是由代码动态生成的。
列1 列2 列3 列4
item名称 控件（textbox） 显示%（label） 详细介绍item

因为有设定了不同的访问等级，要求向访问等级不够的用户隐藏htmltable的列3和列4.
想求教一个思路怎样实现！！谢谢！

静态表单中的列隐藏已经实现，生成表格的代码如下：

    private void generateForm()
    {
        //get all row description from table
        SqlConnection sqlconn = AllStoredProcedures.sqlconnSmartReportApp();
        DataSet formDesription = AllStoredProcedures.ExecuteQuery("sp_GetPLForm","isLoad", SqlDbType.Int,1,"1",sqlconn.ConnectionString);
        string tbArray = "['txt1','2','1'],['txt4','1','4'],['txt5','1','5'],";
        string lblPArray = "['LblpLessCostSales','1'],['LblpGrossMargin','2'],['LblpLabour','4'],['LblpOccCosts','5'],";
        string lblCArray = "['LblcGrossMargin','2'],";
        //Build the form
        ContentPlaceHolder box = Master.FindControl("ContentPlaceHolder1") as ContentPlaceHolder;
        //Build the rows
        for (int i = 0; i < formDesription.Tables[0].Rows.Count; i++)
        {
            Label lbl = new Label();
            TextBox txt = new TextBox();
            Label calField = new Label();
            Label calPercentage = new Label();
            HtmlTableCell txtCell = new HtmlTableCell();
            HtmlTableCell lblCell = new HtmlTableCell();
            HtmlTableCell calcuCell = new HtmlTableCell();
            HtmlTableCell percentCell = new HtmlTableCell();
            HtmlTableRow row = new HtmlTableRow();
            //RequiredFieldValidator reqValid=new RequiredFieldValidator();
            RegularExpressionValidator expValid = new RegularExpressionValidator();
            string description = formDesription.Tables[0].Rows[i].ItemArray[1].ToString();
            int iscalculate = Int32.Parse(formDesription.Tables[0].Rows[i].ItemArray[2].ToString());
            int descriptionID = Int32.Parse(formDesription.Tables[0].Rows[i].ItemArray[0].ToString());
            string direct = formDesription.Tables[0].Rows[i].ItemArray[4].ToString();
            string id = formDesription.Tables[0].Rows[i].ItemArray[3].ToString();
            if (id == "") { id = "null"; }
            switch (iscalculate)
            {
                //show the row contain input field and calculate field
                case (0):
                    {
                        //add label to description
                        lbl.Text = description;
                        lbl.ID = "lbl" + id;
                        lblCell.Controls.Add(lbl);

                        //add textbox for input data
                        txt.ID = "txt" + descriptionID.ToString();
                        txt.Attributes.Add("onblur", "doCal();");
                        txtCell.Controls.Add(txt);
                        expValid.ErrorMessage = "Number Only!";
                        expValid.ControlToValidate = txt.ID;
                        expValid.ValidationExpression = "^([.]|[0-9])*[.]*[0-9]+$";
                        txtCell.Controls.Add(expValid);
                        //add id to javascript array string
                        tbArray += "['" + txt.ID + "','" + direct + "','" + descriptionID + "'],";

                        //add label to show percentage calculate field
                        //calcuCell.Controls.Add(calField);
                        calPercentage.ID = "LblP" + id;
                        //calPercentage.Text =
                        lblPArray += "['" + calPercentage.ID + "','" + descriptionID + "'],";
                        percentCell.Controls.Add(calPercentage);

                        row.Cells.Add(lblCell);
                        row.Cells.Add(txtCell);
                        row.Cells.Add(percentCell);
                        main.Rows.Add(row);
                        break;
                    }
                //show the row only contain calculate field
                case (1):
                    {
                        //add label to description
                        lbl.Text = description;
                        lbl.ID = "lbl" + id;
                        lblCell.Controls.Add(lbl);
                        //add label to show calculate field
                        calField.ID = "LblC" + id;
                        calcuCell.Controls.Add(calField);
                        lblCArray += "['" + calField.ID + "','" + descriptionID + "'],";

                        calPercentage.ID = "lblP" + id;
                        percentCell.Controls.Add(calPercentage);
                        lblPArray += "['" + calPercentage.ID + "','" + descriptionID + "'],";
                        //add cells into row
                        row.Cells.Add(lblCell);
                        row.Cells.Add(calcuCell);
                        row.Cells.Add(percentCell);
                        main.Rows.Add(row);
                        break;
                    }
                //show the row only conatin text
                case (2):
                    {
                        lbl.Text = description;
                        lbl.ID = "lbl" + id;
                        lblCell.Controls.Add(lbl);
                        row.Cells.Add(lblCell);
                        main.Rows.Add(row);
                        break;
                    }
            }

        }//make javascript array
        tbArray += "[0,'','']";
        lblCArray += "[0,'']";
        lblPArray += "[0,'']";

        Page.ClientScript.RegisterStartupScript(this.GetType(), "", " var tbarr = [" + tbArray + "];var lblCarr = [" + lblCArray + "];var lblParr = [" + lblPArray + "]", true);
    }