String is null and not identifiable

Question

I have a parameter in method with name as Course its a string type and default value is null now i am not assigning it any value and it have defult value of null I wrote if condition

if(Course!=null || Course!="" || Course != "null")

{

}

my parameters is null but the if conditio always get true even if my Course is null why it is so

Rijwan Ansari · Answer

Simply use string.IsNullOrEmpty(Course) to validate null or empty.

Jignesh Kumar · Answer

Hello, You can use below to check string is null or empty, string just we need to use inbuilt method which will check string is null or empty. if (!string.IsNullOrEmpty(Course)) { // Your code here } if you want to show string as empty then you can assign, var Course = string.Empty;

Jaimin Shethiya · Answer

You can use the below statement if (!string.IsNullOrWhiteSpace(Course)) { //write here your code }

Vishal Yelve · Answer

try this if (!string.IsNullOrEmpty(Course)) { }

Naimish Makwana · Answer

Try below, if (!string.IsNullOrEmpty(Course) && !Course.Equals("null")) { // Your code here } Thanks

Tahir Ansari · Answer

In your condition, you're using the logical OR ( || ) operator, which means that if any one of the conditions is true, the whole expression will evaluate to true. Since you're checking for different conditions using OR operators, at least one of them will always be true, which is why your if condition is always true. if (Course != null && Course != "") { // Your code here }

Amit Mohanty · Answer

Because you're using the OR (||) operator, if any of these conditions is true, the entire expression will be true. So, even if Course is null, the first condition will be true and the entire condition will be true. To fix this, you should use the AND (&&) operator instead of the OR (||) operator: if (Course != null && !Course.equals("") && !Course.equals("null")) { // Your code here }

Mark Tabor · Answer

I have used only one like if(Course !=null) still same result Also I have tried if(Course!="") still same Also I have tried if(Course!="null") still same my actual value of course is null when I hover the mouse on that variable its value is null

Cr Bhargavi · Answer

if (Course != null && Course != "" && Course != "null") { // Your code here } In this corrected condition, the if statement will only be true if all three conditions are true: Course != null - This part checks if Course is not null. Course != "" - This part checks if Course is not an empty string. Course != "null" - This part checks if Course is not the string "null".

Tahir Ansari · Answer

Based on what you've described, if you are directly checking if (Course != null) and still encountering unexpected behavior where the condition evaluates to true when Course is null, there might be some other issue in your code or environment.