ASP.NET Interview Questions and Answers (1544) - Page 32

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What are the Good Steps to be followed for maintaining Connection Strings in Asp.Net Web Applications ?

There are some basic steps which should be followed inorder maintain Connection strings more efficiently they are

. Connection strings should allways be given in web.config file itself for security resons. Not only for security but also as more accessible at multiple places.

. We should never make connection strings as Declarative property for SqlDataSource control

. Allways Connection strings should be stored in an Encrypted format for secure Database server .

. Do not store it in a plain text format and also never store it in a .aspx page.

What do we Understand by the word "THEME" in asp.net ?

Theme is a group of property settings that allows to define the look and feel of the controls to be consistent through out the Web Application .

One of the advantage with themes is unlike CSS we can even Design server side controls like for example Treeview the style of rendering elements into the browser can be changed as per our wish.

Here we can even change entire Web Application look and feel by just changing the theme properties.

Hence these Themes could be very much useful for UI development of a web application

What is the main difference between DataSet.Clone() and DataSet.Copy() ?

Generally

DataSet.Clone() would copy only the schema of the DataSet object and it would return the DataSet object that has same struture that the previous dataset object which includes all the relations, constraints and schemas as well. This will not copy the data from the existing one to new one.

The existing Dataset ---

private DataSet CreateMyClone(DataSet myCloneDataSet) 

{

DataSet exampleCloneDS;

exampleCloneDS = myCloneDataSet.Clone();

return exampleCloneDS;

}

DataSet.Copy() will copy complete code as well as the structure of the existing DataSet object.

What is Event Bubbling in asp.net ?

For every control in asp.net there are some pre defined events which could be handled for example let us take a button which has an OnClick() event when ever a single click is made to that button that event raises.

But if that particular button is in any of the following Server controls like GridView,Repeater,DataList etc .

We cannot retrieve the button onClick() event directly. For that let us consider we have the same button in GridView.

Here Button is the child control where as the parent control is our Gridview. These child controls do not raise by themselves when they are inside any server controls , they pass the event to the container parent and from then it is passed to our page as "ItemCommand". From the code behind we cann access button onclick event now with that ItemCommand Event of Parent control.

This process of sending the child control events to parent control is said to be
Event Bubbling

Difference Between Web.Config file and Global.asax ?

Web.Config file is used ....

1. To specify the application settings
2. To specify the session mechanism available to use for that application.
3. To Specify the Connection strings.
4. To Specify the authentication and authorization.
5. To Specify the http handlers.
6. To Specify different providers.

Global.asax file is used to specify the session and application event handlers.

What is Data Source Control with example?

With the help of Data Source Control, we can perform the data binding operation by writing some data access code. This is used to retrive a DataReader or a DataSet object from the server and you can show that retrived data in DataGrid, DropDownLIst or in ListBox.

Example:

SqlConnection con = new SqlConnection();

SqlCommand cmd = new SqlCommand("Select * from Emp", con);



SqlDataAdapter da = new SqlDataAdapter(cmd);



DataSet ds = new DataSet();

da.Fill(ds);



GridView1.DataSource = ds;

GridView1.DataBind();