20 GridView Interview Questions and Answers

GridView is a popular data visualization tool used by web developers. When applying for a position in coding or web development, it is likely that employers will expect you to have a strong understanding and familiarity with GridView. Understanding what GridView questions you are most likely to encounter and how to properly answer them improves your chances of making a positive impression on the hiring manager. In this article, we discuss the most commonly asked GridView questions and how you should respond.

GridView Interview Questions and Answers

Here are 20 commonly asked GridView interview questions and answers to prepare you for your interview:

1. What is a GridView?

A GridView is a control that allows you to display data in a tabular format. It is often used to display data from a database, and can be customized to allow you to edit, delete, or select items in the grid.

2. Can you explain the purpose of using a GridView in ASP.NET?

A GridView is used to display data in a tabular format. It is often used to display data from a database, but can also be used to display data from other sources. GridViews are highly customizable, and can be used to provide a wide variety of features, such as sorting, paging, and editing data.

3. How do you create and initialize a new GridView control?

The GridView control is a powerful data grid that allows you to display and edit data in a tabular format. To create a new GridView control, you can use the following code:

GridView gv = new GridView();

gv.ID = “MyGridView”;

gv.DataSource = myDataSource;

gv.DataBind();

This will create a new GridView control with the ID “MyGridView” and bind it to the data source “myDataSource”.

4. How can you add columns to an existing gridview programmatically?

You can add columns to an existing gridview programmatically by using the Add() method of the Columns collection of the gridview.

5. Is it possible to use a multicolumn primary key with a GridView control? If yes, then how?

Yes, it is possible to use a multicolumn primary key with a GridView control. You would need to set the DataKeyNames property of the GridView control to the list of primary key column names.

6. In what ways can data be used for binding in a GridView control?

Data can be used for binding in a GridView control in a number of ways. One way is to use data from a database, such as Microsoft SQL Server. Another way is to use data from an XML file. Finally, data can also be manually entered into the GridView control.

7. What are some best practices for working with the GridView control?

Some best practices for working with the GridView control include using paging and sorting to improve performance and usability, using templates to customize the appearance of the control, and using data binding to bind the control to data sources.

8. What is paging in a GridView?

Paging is a way of allowing the user to view a large amount of data in a GridView by breaking it up into smaller, more manageable pieces. By default, a GridView will display 10 rows of data at a time. However, you can change this setting to display more or fewer rows as needed. Paging can make it easier for the user to find the data they are looking for, as well as improve the overall performance of the GridView.

9. How do you enable paging in a GridView?

Paging in a GridView is enabled by setting the AllowPaging property to true. Once this is done, the GridView will render with paging controls that will allow the user to move through the data one page at a time.

10. What do you understand by CommandFields in a GridView?

CommandFields are buttons that can be added to a GridView control that will allow the user to perform operations such as edit, update, delete, etc. on the data in the GridView.

11. How does RowDataBound work when dealing with a GridView?

RowDataBound is an event that is raised when a row is being data bound to the GridView. This event gives you a chance to manipulate the data that is being bound, or even to cancel the operation entirely. This event is particularly useful when you need to format the data in a certain way, or when you need to perform some calculation on the data before it is displayed.

12. What’s the difference between DataSourceID and DataSource properties in GridView? Which one should be used and why?

The DataSourceID property is used to specify the ID of the data source control that the GridView is bound to. The DataSource property is used to directly specify the data source that the GridView should use. In general, the DataSourceID property should be used, as it allows the GridView to automatically update its data when the data source control is updated.

13. When would you recommend using TemplateField instead of BoundField?

TemplateField is more flexible than BoundField, as it allows you to specify custom controls and data binding expressions. It is therefore useful when you need more control over the appearance and behavior of the data displayed in a GridView.

14. What are some common problems that you might encounter while using a GridView and how do you deal with them?

Some common problems that you might encounter while using a GridView include:

-The GridView not appearing correctly on the page
-The GridView not appearing at all
-The GridView appearing but with no data

There are a few ways that you can deal with these problems. First, check to make sure that you have correctly set up the GridView in your code. This includes setting the correct width and height, as well as setting the correct number of columns and rows. If the GridView still does not appear correctly, try adding a bit of padding or margin to the code to see if that helps. Finally, if the GridView appears but there is no data, check to make sure that you have correctly bound the data to the GridView.

15. What do you understand about the CommandName property of a GridView control?

The CommandName property of a GridView control is used to specify which action will be performed when a button within the GridView is clicked. The value of the CommandName property corresponds to a method that will be called in the code-behind file. For example, if the CommandName property is set to “Edit”, then the Edit method will be called.

16. What is the default sorting order or direction of a GridView?

The default sorting order or direction of a GridView is ascending.

17. Is it possible to display multiple tables in a single GridView? If yes, then how?

Yes, it is possible to display multiple tables in a single GridView. This can be accomplished by using a DataSet object to hold the data from the multiple tables, and then binding the GridView to the DataSet.

18. What do you understand by EditItemTemplate in a GridView?

The EditItemTemplate is a template that defines the appearance of a GridView row in edit mode. This template typically contains input fields that allow the user to modify the data for a given row.

19. What are the different types of edit modes available in a GridView?

There are three different types of edit modes available in a GridView: Edit, Insert, and Delete. In Edit mode, you can change the values of existing data. In Insert mode, you can add new data. In Delete mode, you can delete existing data.

20. Where will you store GridView templates if they need to be accessed from more than one page?

There are a few different ways that you could store your GridView templates, depending on your specific needs. One option would be to store them in a separate file, and then reference that file from each page that needs to use the templates. Another option would be to store the templates in a database, and then retrieve them as needed.