Textbox doesn't accept null

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ASP.NET

I've a textbox which should accept null(textbox is empty). But the null value is not inserting in database(sql server). The error is "Input string was not in a correct format". The coding is

C#

int BusinessNumber = Convert.ToInt32(txtBusinessNumber.Text);

if .ToString() is not working.

Posted 18-Oct-13 22:20pm

Sriram Ramachandran

Updated 18-Oct-13 22:29pm

Kenneth Haugland

v2

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Kenneth Haugland · Answer 1 · 2013-10-18T22:27:00

Solution 1

This could be solved in a number of ways:
http://msdn.microsoft.com/en-us/library/f02979c7.aspx[^]

or perhaps better in your case:
http://msdn.microsoft.com/en-us/library/system.string.isnullorempty.aspx[^]

Posted 18-Oct-13 22:27pm

Kenneth Haugland

Comments

Siva Hyderabad 19-Oct-13 5:03am

try this

Convert.ToInt32(txtBusinessNumber.Text.Trim().ToString());

Sriram Ramachandran 19-Oct-13 5:39am

no its not working ......... Same error.........Input string is not in a correct format .....

phil.o · Answer 2 · 2013-10-18T23:09:00

You have to check whether there is an actual value in your textbox, and if it is convertible to Int32. This way:

C#

int BusinessNumber;
if (!string.IsNullOrEmpty(txtBusinessNumber.Text) && int.TryParse(txtBusinessNumber.Text, out BusinessNumber)) {
   // TextBox contains a valid Int32 value
}
else {
   // TextBox is empty or does not contain a valid Int32 value
}