连接数据库....

    public static OleDbConnection con()
    {
        String myConnstring = @"provider=microsoft.jet.oledb.4.0;data source=my.mdb;Persist Security Info=True;Jet OLEDB:Database Password=456852;";
        OleDbConnection MyConnection;
        MyConnection = new OleDbConnection(myConnstring);
        return MyConnection; 
   
    }

字符串转为数字

Convert.ToInt32(s);

数字转为字符串

 int varInt = 1;
string varString = Convert.ToString(varInt);
string varString2 = varInt.ToString();