Technical interview questions and answers are critical when preparing for an AJAX Interview because companies want to evaluate your understanding of asynchronous communication, XMLHttpRequest, JSON handling, DOM manipulation, and interactive web applications. AJAX is considered a core concept in modern web development, and many companies include it as part of their technical rounds for frontend and full-stack developer roles. Organizations like TCS, Infosys, Wipro, Cognizant, and Capgemini frequently ask AJAX-related questions to check whether candidates can build dynamic, responsive, and efficient web pages. This guide includes commonly asked AJAX interview questions with clear explanations to help freshers and job seekers strengthen their web development fundamentals. These questions will improve your preparation for placement interviews, coding rounds, and real-time project discussions.
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171. What does the Initial Catalog parameter define in the connection string?
The database name to connect to.
172. What does the Dispose method do with the connection object?
Deletes it from the memory.
173. What is a pre-requisite for connection pooling?
Multiple processes must agree that they will share the same connection, where every parameter is the same, including the security settings. The connection string must be identical.
174. How is the DLL Hell problem solved in .NET?
Assembly versioning allows the application to specify not only the library it needs to run (which was available under Win32), but also the version of the assembly.
175. What namespaces are necessary to create a localized application?
System.Globalization and System.Resources.
176. What is the smallest unit of execution in .NET?
an Assembly.
177. When should you call the garbage collector in .NET?
As a good rule, you should not call the garbage collector. However, you could call the garbage collector when you are done using a large object (or set of objects) to force the garbage collector to dispose of those very large objects from memory. However, this is usually not a good practice.
178. How do you convert a value-type to a reference-type?
Use Boxing.
179. ctype(123.34,integer) - should it throw an error? Why or why not?
Answer1
It would work fine. As the runtime type of 123.34 would be double, and Double can be converted to Integer.
Answer2
the ctype(123.34,integer) will work fine no errors
180. directcast(123.34,integer) - should it throw an error? Why or why not?
It would throw an InvalidCast exception as the runtime type of 123.34 (double) doesnt match with Integer.