E ) Auto Incriment (ID and Cusno) assigment

                                                  * Auto Incriment *

                    *  Auto Generate Id 
        code :-   string k = "select count(id)+1 from paradb";     //id incrimiment by +1 auto
                    cm = new SqlCommand(k, cn);

                    txtid.Text = cm.ExecuteScalar().ToString();

                * Auto generate Cusno 
      code :- txtcusno.Text = "NR-" + DateTime.Now.ToString("yyyy") + "00-" + txtid.Text;
          

                                    * Auto genrate id and cusno concept video*

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