Adding Bootstrap In ASP.NET Web Forms Using NuGet Package.
1 Start Visual Studio. Go to File menu >> New >> Project.
2 In the New Project window, go to Installed >> Visual C# >> Web.
3 Select ASP.NET Web Application (.NET Framework), Enter the name of the project and press OK button. (I’ve also selected .NET Framework 4.7.1. But, It is optional.)
4 In the next screen, New ASP.NET Web Application, select Web Forms under Templates and press OK button.
5 The ASP.NET Web Forms project is now created.
6 To check the bootstrap version, right-click the solution in solution explorer and select Manage NuGet Packages For Solution…. In the Manage NuGet Window, look for bootstrap package and select it. In the right panel, you can see that the installed version of bootstrap is 3.0.0 and the latest stable version is higher than that. In my case the latest stable version is 4.0.0.