how to check whether decimal is null or not

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3.67/5 (2 votes)

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C#

how to check whether the enterd decimal is null or not?

Posted 6-May-11 1:37am

bsb25

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Comments

Oshtri Deka 6-May-11 7:44am

Which control do you use for input?

4 solutions

Solution 4

If you are using a nullable decimal (decimal?) you can check the HasValue property

C#

decimal? d;
if (!d.HasValue)
{
//d is null 
}

Posted 6-May-11 2:14am

Jeremy Hutchinson

Comments

Sergey Alexandrovich Kryukov 6-May-11 11:12am

Correct, my 5, but... a bit incomplete.
Please see my answer for additional notes.
--SA

Solution 3

You can use the answer of John Simmons or you can use the tryparse() function.

Posted 6-May-11 1:47am

arindamrudra

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#realJSOP · Accepted Answer · 2011-05-06T01:45:00

Solution 1

What do you mean by "entered decimal"? If you're talking about a textbox, you could do this to check for null:

C#

if (string.isNullOrEmpty(textbox.Text))
{
    // entry is null
}

If you're getting it from a database query:

C#

if (IsDbNull(myDecimalValue))
{
    // entry is null
}

Posted 6-May-11 1:45am

#realJSOP

Updated 6-May-11 1:49am

v2

Comments

arindamrudra 6-May-11 7:48am

My +5 because, both of the cases are given.

Sergey Alexandrovich Kryukov 6-May-11 11:09am

Even though the check is correct, you cannot enter null string in text box.
What is myDecimalValue type?
--SA

Sergey Alexandrovich Kryukov · Accepted Answer · 2011-05-06T05:12:00

Unfortunately (:-)), you cannot enter null decimal in any ways of entering I know. If you really want to enter the value of null for nullable type you can do it artificially by adding some check box "Is null". I don't think you need it. In this way, in all other cases you never need to check it. See the solution by Jeremy on how to work with nullable types. One mode note: you can also check "if (d == null)", assign "d = null;", and so on.

—SA

how to check whether decimal is null or not

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