How to set the default document for vs2019 Webform project

1. Right-click on the root directory of the project (usually the project name) and select "Properties".
2. In the properties window, find the "Web" tab.
3. In the "Startup Action" section, you can see a "Default Document" option.
4. In "Default Document", enter the file name you want to set as the default document. For example, if you want to set "Default.aspx" as the default document, just enter "Default.aspx" in the input box.
5. Make sure to save the changes.