文本框中的自动增量没有来自数据库c#

Question

string connectionstring = ConfigurationManager.ConnectionStrings["myConnectionString2"].ConnectionString;
            SqlConnection con = new SqlConnection(connectionstring);
            SqlCommand cmd = new SqlCommand();
            SqlDataAdapter da = new SqlDataAdapter("Select Max(VchNo) from tran1 where VchType=9 ", con);
            DataSet ds = new DataSet();
            da.Fill(ds);


            txtCIN.Text = ds.Tables[0].Rows[0][0].ToString();
            txtCIN.Text = Convert.ToString(Convert.ToInt32(txtCIN.Text) + 1);

Answer 1

string connectionstring = ConfigurationManager.ConnectionStrings["myConnectionString2"].ConnectionString;
        SqlConnection con = new SqlConnection(connectionstring);
        SqlCommand cmd = new SqlCommand();
        SqlDataAdapter da = new SqlDataAdapter("Select Max(VchNo) from tran1 where VchType=9 ", con);
        DataSet ds = new DataSet();
        da.Fill(ds);
       string vchno = ds.Tables[0].Rows[0][0].ToString();
       string a = vchno;
       a = vchno.Substring(0,(a.Length-8));
       a = (int.Parse(a) + 1).ToString();
       txtCIN.Text = a +"/2018-19";