Firstly add image by clicking the option "add existing item" from the website "demo"(can give any name) on solution explorer.
Then we can select any image from computer and add it in solution explorer.
From toolbox then select "image " into web form demo1.
Then change properties of it where imageurl option is to be changed by adding image.
|web form demo1 in website demo|
|Clicking option add existing item from website demo|
|Here remember to change file name to all files and select any image|
|Now add image from toolbox to webform like this|
|select image and change property by adding image into image url like this|