Disable btnADd if column.status = "O"

Hi

 I want to Disable btnADd if column.status = "O"

try

{

    StringBuilder htmlTable =new StringBuilder();

    string ParticipantType ="";

  

    BALTrainingHeader bALTrainingHeader =new BALTrainingHeader();

    List Result = bALTrainingHeader.GetRecordListDrafted();

  

    if (Result !=null)

    {

        BALEmployee bALEmployee =new BALEmployee();

        htmlTable.Append("

");

  

        htmlTable.Append("

");

        htmlTable.Append("

");

        foreach (var columin Result)

        {                      

            htmlTable.Append("

");

            htmlTable.Append("

");

            htmlTable.Append("

");

            htmlTable.Append("

");

            htmlTable.Append("

");

        }

        htmlTable.Append("

");

        htmlTable.Append("

#	Training NumberActions	Add
" + colum.TrainingID +"	" + colum.TrainingNumber +"

");

  

        PlaceHolderTable.Controls.Add(new Literal { Text = htmlTable.ToString() });

    }

}

Thanks