textbox validation

Question

hello there 

i have just create a software in which 6 textbox is there the textbox 1and 2 is for input and textbox 3 is for output which is the addition of the texbox 1 and 2. 

and again textbox 4and 5 is for input and textbox 6 is for output which is addition of textbox 4 and 5.

the problem is that when i use only textbox 1,2and 3 it gives error pls any body help me out how can i ignore the textbox 4,5and 6 . 

Answer 1

Dear Null and Character String cant Add by this way if you want to add numeric then you should do like this


TextBox3.Text = (Convert.ToDouble(Convert.ToString(textBox1.Text)) + Convert.ToDouble(Convert.ToString(textBox2.Text))).ToString();

in Text Change Event

it will convert zero if null exist



you can also chaeck by TextBox1.TextLenght  = 0  then zero value

Answer 2

Yes, It would raise error as you are trying to add "" (empty text) with your 2/3 texbox's values(integer).

Just initialize (default Text value) all your textboxes with 0 or 0.00

So, no matter how many inputs you give, it will not give you error. 

Answer 3

hello there 

it is a windows application now i am attaching my whole project in this project i am doing five addition and get and get five output at a click but is i only want to do only 2 addition and the remaining textbox left emty then the programme is showing error THAT """Input string was not in a correct format."""""  

please help me to ignore the remaining textbox 

Answer 4

Is it a Win or Web application? And what kind of error are you getting? How are you implementing your logic? 
Please provide more details to resolve your problem.