Readonly of Objects in the Detail Table with the Button

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"); To remove Readonly

} 
      }   
       }