Hi Ganesan,
Well actually it is not the Project Template that does it. It is in fact the Blazor Code Generator that causes this change.
1. Create a standard Blazor Server Project using the Project Template, selecting the Material theme and the Grid Sample.
2. Check that _Host.cshtml is referencing Material.css theme.
3a. Add in requisite context and model classes sufficient to run the Blazor Code Generator Grid.
3b. Add in required NuGet packages for EF Core etc.
Install-Package Microsoft.EntityFrameworkCore.SqlServer
Install-Package Microsoft.EntityFrameworkCore.SqlServer.Design
Install-Package Microsoft.EntityFrameworkCore.Tools
3c. Scaffold-DbContext -Connection "Server=PRESIDENT\SQLEXPRESS;Database=Northwind;Trusted_Connection=True;" -Provider "Microsoft.EntityFrameworkCore.SqlServer" -DataAnnotations
4. Go to Index.Razor
5. Use Extensions->Syncfusion->Essential Studio for Blazor->Blazor Code Generator (right-click in .razor file is not present)
6. Select Grid and fill out the details. Complete the wizard.
7. Go to _Host.cshtml.
8. Note that the bootstrap theme is now present, after the material.css theme.