c# - autoincrement number in textbox -

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how autoincrement value in textbox1(which id) everytime click save button? problem value in textbox1 increments everytime run winform.

for example, run winform , last value id has 2, textbox1 generate number 3 , after click save button doesn't generate next number instead increment if close form , rerun again. plsss help..

in form load

  private void form1_load(object sender, eventargs e)     {         int a;         string path1 = "data source=localhost; initial catalog= ss; username=root; password=''";         mysqlconnection con = new mysqlconnection(path1);         con.open();         string query = "select max(id) inc";         mysqlcommand cmd = new mysqlcommand(query, con);         mysqldatareader dr = cmd.executereader();         if (dr.read())         {             string val = dr[0].tostring();             if (val == "")             {                 textbox1.text = "1";             }             else             {                 = convert.toint32(dr[0].tostring());                 = + 1;                 textbox1.text = a.tostring();             }         }     }

in save button

 private void button1_click(object sender, eventargs e)     {         string path = "data source=localhost; initial catalog= ss; username=root; password=''";         mysqlconnection sqlconn = new mysqlconnection(path); //communicator //constructors         mysqlcommand sqlcomm = new mysqlcommand();         mysqldatareader sqldr;         sqlconn.open();         sqlcomm.connection = sqlconn;         sqlcomm.commandtype = commandtype.text;         sqlcomm.commandtext = "select * inc id=" + textbox1.text + "";          sqldr = sqlcomm.executereader();         sqldr.read();          if (sqldr.hasrows)         {             textbox3.text = sqldr[0].tostring();          }         sqlconn.close();           if (textbox1.text == textbox3.text)         {             messagebox.show("id exists!");          }          else         {             string path1 = "data source=localhost; initial catalog= ss; username=root; password=''";             mysqlconnection sqlconnn = new mysqlconnection(path1); //communicator //constructors             mysqlcommand sqlcommm = new mysqlcommand();             sqlconnn.open();             sqlcommm.connection = sqlconnn;             sqlcommm.commandtype = commandtype.text;             sqlcommm.commandtext = "insert inc (id,lastname) values ("+ textbox1.text +", '" + textbox2.text + "')";             sqlcommm.executenonquery();             sqlconnn.close();             messagebox.show("record saved!");         }     }

what need update textbox1.text after saving record

... sqlcommm.executenonquery(); sqlconnn.close(); messagebox.show("record saved!"); //update textbox1.text ....

you have generate next value next saving!


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