The string.IsNullOrEmpty() method is used to check if a string has null or string.Empty value in it or not in C#.
$string=""if($string) {Write-Host"The variable is not null."}else{Write-Host"The variable is null." } Output: The variable is null. White space characters are not considered null string values. Use theIsNullorEmptyMethod to Check if a String Variable Is Not Null or Empty in PowerShell...
How to check string array is not null in C# How to check the date range in where clause using case statements in SQL Server. How to check the givem email address exists or not? how to check Var is empty or null in Linq How to check when and who started the Windows service. How ...
Conversion from type 'DBNull' to type 'String' is not valid (How to fix this code) convert .dbml to entity Convert a datatable column from string to integer convert arraylist tinto datatable convert dataset to object in c# Convert IQueryable to Datatable Convert Linq to SQL Convert linq t...
Convert a String into achararray and check it withCharacter.isDigit() NumericExample.java packagecom.mkyong;publicclassNumericExample{publicstaticvoidmain(String[] args){ System.out.println(isNumeric(""));// falseSystem.out.println(isNumeric(" "));// falseSystem.out.println(isNumeric(null));...
-z is the second supported bash string comparison operator used to check if a string is empty or not. The -z operator functions similarly like -n operator. Below is an example: Most importantly, you should add spaces around the square brackets. If there are no spaces, bash will complain ...
When we dereference a pointer, it is our responsibility to ensure that it points at a valid address. In this article, we will discuss three methods to check if a pointer is NULL in C++. Table of Contents [hide] Comparison with nullptr Comparison with 0 Using the value of pointer as a...
Learn how to convert a string to a number in C# by calling the Parse, TryParse, or Convert class methods.
So I need to check iffssuitebale forHSSFWorkbook()or forXSSFWorkbook() Any idea how can I check it without extension of file? IWorkbook workBook =null;stringfileExtension = Path.GetExtension(path);using(varfs =FileStream(path, FileMode.Open, FileAccess.Read)) ...
To check for non-null/non-zero string variable, i.e. if set, use if [ -n "$1" ] It's the opposite of -z. I find myself using -n more than -z. You would use it like: if [ -n "$1" ]; then echo "You supplied the first parameter!" else echo "First parameter not ...