
write a code in dot net which connects to a database, retrieves the data and allows to input a valid phone number.

sql connection con = new sql connection(); con.connection string= "data source = server name;initial catalog= databse name; integrated security= true"; con.open();

sql connection con = new sql connection();
con.connection string= "data source = server name;initial catalog= databse name; integrated security= true";
con.open();