رفع اشکال در مورد اتباط با دیتابیس

این کد رو نوشتم .

نقل قول:

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myda = new SqlDataAdapter("select * from book_sabt", sqlcon);
myds = new DataSet();
mydv = new DataView();
find_row = -1;
myda.Fill(myds, "book_sabt");
mydv.Table = myds.Tables["book_sabt"];

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بعد روی خط پنجم این اشکال رو می گیره لطفا کمکم کنید و بگید چکار کنم .

نقل قول:

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An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server

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sql adapter یه sql connection هم میخواد
dim con as new sqlconnection1("datasource=localhost")
my.connection=con