Asp.NET – connectionString error while trying to connect with Microsoft SQL Server Management Studio (SQLEXPRESS)

I am trying to make a connection between my Asp.NET project and Microsot SQL Server Managment Studio.
Just following a tutorial from freeCodeCamp : Learn ASP.NET Core MVC (.NET 6) – Full Course.
My problem began in 1:31:51

But I guess my connectionString doesn’t work:

"ConnectionStrings": {
    "DefaultConnection": "Server=.\\SQLEXPRESS;Database=Bulky;Trusted_Connection:True;"
 }

Error: Format of the initialization string does not conform to specification starting at index 35.

I checked my server name:

I am writing same stuff except different things like server name in the tutorial.

I’d be glad if you can help…

>Solution :

you have : in your Trusted_Connection, change : to =

"ConnectionStrings": {
    "DefaultConnection": "Server=.\\SQLEXPRESS;Database=Bulky;Trusted_Connection=True;"
 }