Detay Tablo İçerisindeki Nesnelerin Buton ile Readonly Yapılması

using System.Web.UI.WebControls; 

    public void Button1_OnClick(Object sender, EventArgs e)
        {
          
         if(DetailsGrid1.CurrentRowCount > 0)

      {
        for(int i=0;i<DetailsGrid1.CurrentRowCount;i++)
   {
      ((TextBox)DetailsGrid1.GetRowObject(i,"Text1")).ReadOnly =true;

      ((eBADateTimeBox)DetailsGrid1.GetRowObject(i,"Text2")).ReadOnly = true;
     
      ((DropDownList)DetailsGrid1.GetRowObject(i,"List1")).Attributes.Add("disabled","disabled");
     
      ((eBAComboBox)DetailsGrid1.GetRowObject(i,"List2")).ReadOnly = true;

     //((DropDownList)DetailsGrid1.GetRowObject(i,"List6")).Attributes.Remove("disabled"); //Readonly kaldırmak için

    } 
      }   
       }