integer textbox not accept null value

Question

1.00/5 (1 vote)

See more:

if (txt_CheqNo.Text == "")
                {
                    objdal.Cheq_No =Convert.ToInt16("");
                }
                else
                {
                    objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
                }

i have textbox wich store numeric value.
but when textbox i leave empty,it creates error.
error:Input string was not in a correct format.

i have to not put requierfield to fill textbox.i have the situation in many case to leave it empty.i have to keep it complatly blank.Not '0' or anything else to enter in it.

how to solve this?

Posted 24-Feb-13 23:14pm

Member 9511889

Updated 24-Feb-13 23:22pm

v3

Add a Solution

Comments

MalwareTrojan 25-Feb-13 5:18am

Have you given any condition for Numeric if yes then Let me see that codes.

5 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Answer 1 · 2013-02-24T23:31:00

Solution 1

Simple: don't try to do a convert:

C#

if (txt_CheqNo.Text == "")
    {
    objdal.Cheq_No = 0;
    }
else
    {
    objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
    }

But a better way would be:

C#

objdal.Cheq_No = 0;
if (!string.IsNullOrWhiteSpace(txt_CheqNo.Text))
    {
    objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
    }

Posted 24-Feb-13 23:31pm

OriginalGriff

Comments

Member 9511889 25-Feb-13 5:35am

i have to not insert '0' or anything else in it.

OriginalGriff 25-Feb-13 5:55am

Either you assign it a value, or you don't - int datatypes *always* have a value, unless they are declared as nullable (which is very unusual). You could just "leave it alone" and not assign it a value, but that is likely to cause even more problems as it will retain the previous value.

Jegan Thiyagesan 25-Feb-13 5:48am

Hi,
"int" is a primitive type and it will always have a value, you cannot assign null to a primitive type.

if you want you can make your "objdal" to a nullable "Integer" type or a "string" type.

Regards
Jegan

ZaneArellano · Answer 2 · 2013-02-24T23:40:00

Solution 2

visit this link it might help you.
this also traps other non numeric inputs

http://social.msdn.microsoft.com/forums/en-US/winforms/thread/84990ad2-5046-472b-b103-f862bfcd5dbc/[^]

Posted 24-Feb-13 23:40pm

ZaneArellano

S R JHALA · Answer 3 · 2013-02-25T00:02:00

Solution 3

best way is below written code which will not give parser error.

C#

Int16 _cheq_No;
Int16.TryParse(txt_CheqNo.Text, out _cheq_No);
objdal.Cheq_No = _cheq_No;

Posted 25-Feb-13 0:02am

S R JHALA

Updated 25-Feb-13 0:04am

v3

Shobhana.n · Answer 4 · 2013-02-25T00:54:00

If you want to set null values then you can do like this
but objdal.Cheq_No should be nullable.
if (txt_CheqNo.Text == "")
{
objdal.Cheq_No =null;
}
else
{
objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
}

Other wise dont convert when text box is null or empty.
if (txt_CheqNo.Text != "")
{
objdal.Cheq_No = Convert.ToInt16(txt_CheqNo.Text);
}

raj ch · Answer 5 · 2013-02-25T01:02:00

Solution 5

try this one

VB

If txtMRNO.Text.Length = 0 Then
          code here
       End If

Posted 25-Feb-13 1:02am

raj ch