Error:Foreign Key constraints using Visual Studio with SQL Server Database ~ GNIITHELP

when you try to save dbo.Table2 after entry in Table2 it will show ERROR given below:

{
'Table1' table saved successfully
'Table2' table
- Unable to create relationship 'FK_Table2_Table1'.  
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint "FK_Table2_Table1". The conflict occurred in database "~\FOREIGNKEY\APP_DATA\DATABASE.MDF", table "dbo.Table1", column 'Id'.
}

Solution: 
press ctrl+s and save dbo.Table2 first then do the data Entry in Table 2.
If you do entry in Table2 without saving it. then it will not follow Foreign Key constraints.