windows appln

Question

can u help me to ans this
i have a form ...
in that i have 4 textbox called customerid,name and address,phone no
but customerid entered starts with letter'C' and has three digits after it,
and the phone no value should be integer ..
how can u do it ..plz help ...me

Vulpes · Answer

You can validate the customer number as follows: string custId = txtCustId.Text.Trim(); if (custId.Length == 4 && Char.ToUpper(custId[0]) == 'C') { for(int i = 1; i { if(c '9') { MessageBox.Show(Not a valid customer number. Please amend); txtCustId.Focus(); return; } } } else { MessageBox.Show(Customer number be in the form Cxxx. Please amend); txtCustId.Focus(); return; } If the phone number is a 'pure' integer (i.e. no dashes) you can validate it as follows: string phone = txtPhone.Text.Trim(); if (phone.Length > 0) { foreach(char c in phone) { if(c '9') { MessageBox.Show(Not a valid phone number. Please amend); txtPhone.Focus(); return; } } } else { MessageBox.Show(You haven't entered a phone number yet.); txtPhone.Focus(); return; }