What's the different between Auto-generated and specific return type of stored procedure in LINQ

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LINQ

DataGridView

C#5.0

I have a stored procedure Get_All_Customers, it selects 4 columns from the Customers table. The result is displayed in a DataGridView.

There are 2 cases when calling the stored procedure:

When the return type be auto-generated:
the DataGridView will contain the 4 columns that the stored procedure selects

When the return type be specific (Customer):
The DataGridView will contain 5 columns (not 4 that the stored procedure selects)

the linq code in the tow cases is :

dgvCustomers.DataSource = db.GET_ALL_CUSTOMERS();

But the result will changes by return type change