How to insert image into database ?

I would recommend that you keep the images in your file system, and just keep a relative path in your table.

Images are large and will bloat your database.
While one image may only be an MB or two, try doing SELECT * FROM tImages when you have a few thousand rows. It is not a pretty site.

The image will need to be reconstituted to be seen
What this means is that after you (finally) receive the bytes from the database, you will have to utilize a memory stream or some other byte array to contain this and to feed it to the end user. This will chew up some memory and CPU ticks.
If the end user is using a web browser to view this, there will be no cacheing of the data, so every time the picture is called it will be a new client-server-database-server-client trip. As opposed to a simple client-cache if it was a "physical" file.

In short, it is a performance nightmare. You will be using more resources both in the database and in the application.
You will also have a negative impact on other applications calling the database. And you might as well chalk up anyone else using the network as those BLOBs of data move around.

There are very few legitimate needs that would require this.