ERORR: non-invocable member 'data.table.rows cannot be used like a method.

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C#

I am trying to get data from database table SQL to Textbox in the form (copmany) . I create class for the form contain a function to get the max value of row in the table

//  class COMPCLS 
 public DataTable MaxNEW()
            {
                var DAL = new SQlcls.DataAccessLayer();

                var DT = new DataTable();
                DT = DAL.SelectData_txt("SELECT ISNULL(MAX (ID)+1,1) FROM [dbo].[company]", default);
                return DT;
            }

. then in the form (company) i create :

//FRM_COMPANY
 public void MAX_NEW()
        {
            COMPCLS cmp = new COMPCLS();
            var DT = new DataTable();
            DT = cmp.MaxNEW();
            if (DT.Rows.Count > 0)
            {
                TXT_ID.Text = DT.Rows(0)(0).ToString();
                
            }

        }

it shows the error "

Non-invocable member 'Data.Table.Rows cannot be used like a method.

What I have tried:

I try search but I cannot get the answer