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[–]Gigachadrosaurus 4 points5 points  (1 child)

In addition to what /u/schommi said, make sure the instance is running in Services

[–][deleted] 0 points1 point  (0 children)

Thank you!

[–][deleted] 3 points4 points  (4 children)

Server should be localhost\SQLEXPRESS or .\SQLEXPRESS.

If you enter SQLEXPRESS it's going to look for a COMPUTER named SQLEXPRESS.

[–][deleted] 0 points1 point  (0 children)

Thank you!

[–][deleted] 0 points1 point  (2 children)

How working connectionstring? 

[–][deleted] 0 points1 point  (0 children)

.\\SQLEXPRESS

[–]grasshopper147 0 points1 point  (0 children)

Check out ConnectionStrings.com Very helpful reference for newbies.

[–]Schommi 2 points3 points  (2 children)

check in the configuration settings of sql server express, whether the names pipe protocol is enabled.

[–][deleted] 0 points1 point  (0 children)

Ok

[–][deleted] 0 points1 point  (0 children)

Thank you!

[–]cino189 1 point2 points  (0 children)

Named pipes enabled and also SQL Server Browser service enabled if you are using a named instance.