when admin approve/reject any document once then when admin again login then he/she not be able to approve/reject documents again and dropdownlist will be disabled only for those documents which can be once approve/reject then when admin view any new documents then drop down will be enable and when admin approve/reject this document then it will be disable dropdownlist for not approve /reject again

for this i do this

```
protected void OnRowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        //Find the DropDownList in the Row

        DropDownList abc = (e.Row.FindControl("DropDownList9") as DropDownList);
        abc.Enabled = false;
    }
}

```

but this code show me all dropdownlist are disable .

any solution how i will do this?