c# - How can i access previous value of a variable? -


i want access previous value of global variable "i". here code.

int = 0;     private void btnsave_click(object sender, eventargs e)     {         if (con.state == connectionstate.open) { con.close(); }         try         {              con.open();             i++;             //int i2=i-1;             string s = "insert add_information values('"+i +"','"+ txtcompanyname.text + "','" + txtoffaddress1.text + "','" + txtoffaddress2.text + "','" + txtcityandpin.text + "','" + txtcontactpersonname.text + "','" + txtdesignation.text + "'," + txtoffphoneno.text + "," + txtfaxno.text + "," + txtmobileno.text + ",'" + txtofficialemailid.text + "','" + txtpersonalemailid.text + "','" + txtalternativecontactpersonname.text + "','" + txtwebsite.text + "','" + txtclientclassification.text + "','" + txtdetails.text + "','" + txtgroup.text + "','" + picturebox1.image + "')";                sqlcommand cmd = new sqlcommand(s, con);             if (cmd.executenonquery() >= 1)             {                  messagebox.show("succesfully updated !!");              }             con.close();         }         catch (exception ex)         {             /*if(txtfaxno.text==""||txtmobileno.text==""||txtoffphoneno.text=="")             {                 messagebox.show("fax no,mobile no,office no should not character");             }*/             con.close();             messagebox.show(ex.message);         }

i want access previous value of stored in data table add_information after current form closed

i agree adil if don't want make

add_information

identity write stored procedure return max value of

add_infomation

from table , use it


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