Bool Value in C#

Question

Hi

What is the bool and why are we use in event form?

private bool UploadImage(string UploadPath)
{
   bool retVal = true;
   string strFileName;
   string strFilePath;
   string strType;
   string strFolder = UploadPath; //save it here
   string err = "";
   string ext = "";

Prabhu Raja · Answer

Bool is a Datatype just like intstring etc.. if you declare a variable of bool datatype that variable can hold values True or false only. Bool is mainly used in conditional expressions  to check whether the condition is satisfied or not. for example int i =1; // integer variable if(i > 0) // Here bool is used indirectly { } bool isSuccess = true; // bool variable if(isSuccess==false) // Here bool is used in both directly and indirectly { } bool is used in many ways to check condition to verify the process is completed or not validations etc. bool is used in most of all places not only in events. The Wikipedia described boolean data type in details. http://en.wikipedia.org/wiki/Boolean_data_type you can also use MSDN to know more about bool http://msdn.microsoft.com/en-us/library/c8f5xwh7(v=vs.71).aspx

Karthik Agarwal · Answer

Based on the code you shown bool used in the first line as follows private bool UploadImage(string UploadPath) says that the function's return type is boolean type which means it sends either true or false to the function which called it. And when it comes to the next place where you used bool in your code bool retVal = true; here you are making the bool variable as true i am not wrong at the end of the function you would have returned that to the calling function as follows: return retValue; which sends true to the calling function. Which in turn means that the operation you intend to do in this function is done or succeeded.

Satyapriya Nayak · Answer

Hi Rajesh bool is used to declare variables to store the Boolean values true and false . Refer http://www.dotnetperls.com/bool Thanks