how to validate a numeric field?

ibm220

I need to validate a field which is numeric. Can anyone point me in the right direction? I am really new to programming and do not know how to go about crreating a method or furnction to validate a textbox field every time a user enters data into it. Thanks in advance, Lee

2 Replies

Know the answer? Post it — somebody with the same question will find it here.

mhelal22y ago
you can use ASCII Code test also :) here you are a complete "ValidateData" method which use enum DataType {Number,Char}, check if the textBox data is numeric or chars?!, and return true or false:
private bool ValidateData(string data, DataType type) { if(type == DataType.Number) { for(int i =0; i< data.Length;i++) { int charUn = Convert.ToInt32(data[i]); if((charUn >= 48) && (charUn <= 57)) { continue; } else { return false; } } return true; } else { for(int i =0; i< data.Length;i++) { int charUn = Convert.ToInt32(data[i]); if(((charUn >= 65) && (charUn <= 90)) ||((charUn >= 97)&&(charUn <= 122)) ||(charUn == 32)) { continue; } else { return false; } } return true; } }
hope useful!
jose.acidrain22y ago
The only way i´ve fonded to do this is using the Parse method: try { int.Parse("text of the field to validate"); //If it is numeric this code is executed } catch { //If it is not numeric this code is executed } Cheers!