how to check null values using if condition in C#

Question

i have multiple conditions in my IF statement but only the second one works in other words the null values is not detected. i know the fields are blank or null but it is not detecting it. The email is fired only if keep the 2nd condition and remove the first one but i want to check both conditions before i sent the email out. thanks here is my code

string k = gr.Cells[9].Text;
DateTime strExpectedSubDate = DateTime.Parse(gr.Cells[3].Text);
DateTime strDate = DateTime.Now.Date;

if (k == null && strExpectedSubDate < strDate)
{
    send email();

I would suspect Text does not return null here.. gravity exists. Check the initial assumptions - preferably with a debugger. — user166390
– user166390, Commented Nov 12, 2012 at 22:45
i think you are right i don't see null when i put it in debug mode but the value i see like this and i don't know what it means: "&nbsp" — moe
– moe, Commented Nov 13, 2012 at 1:34
  is HTML code for a space character (specifically, a "non-breaking space"). The lesson here is never to rely on what you see - use a debugger or some other in-code mechanism to find out what's really there. — prprcupofcoffee
– prprcupofcoffee, Commented Nov 13, 2012 at 14:15
Also, if you feel you've answered your own question, accept your answer as "the" answer. — prprcupofcoffee
– prprcupofcoffee, Commented Nov 13, 2012 at 14:16

prprcupofcoffee · Accepted Answer · 2012-11-12 22:46:13Z

6

Try if (string.IsNullOrEmpty(k) && strExpectedSubDate < strDate).

answered Nov 12, 2012 at 22:46

prprcupofcoffee

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Comments

gdoron · Accepted Answer · 2012-11-12 22:46:35Z

2

You might want to change to:

if (string.IsNullOrWhiteSpace(k) && strExpectedSubDate < strDate)

Or:

if (string.IsNullOrEmpty(k) && strExpectedSubDate < strDate)

Which equals to:

if ((k == null || k == string.Empty) && strExpectedSubDate < strDate)

answered Nov 12, 2012 at 22:46

gdoron

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Comments

codingbiz · Accepted Answer · 2012-11-12 22:47:26Z

1

Try

if (String.IsNullOrEmpty(k) && strExpectedSubDate < strDate)
{
 // send email

}

answered Nov 12, 2012 at 22:47

codingbiz

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Comments

JohnLBevan · Accepted Answer · 2012-11-12 22:47:32Z

1

What you've got is fine for checking if k is null. If you also want to check if it's empty try:

if (string.IsNullOrEmpty(k) && strExpectedSubDate < strDate)
{
    SendEmail();
}

answered Nov 12, 2012 at 22:47

JohnLBevan

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Comments

moe · Accepted Answer · 2012-11-13 01:45:57Z

1

i think this is how i solved my problem

if (K == ("&nbsp;") && strExpectedSubDate < strDate)
and it worked fine.  thanks

answered Nov 13, 2012 at 1:45

moe

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