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I searched through this site and found some topic about my problem but still cannot make this work....
I am simply trying to retrieve data from SQL Database using a stored procedure.
I am passing one parameter that is a SqlDbType.Varchar(50) type, but get back an SQL error:
Procedure or function 'WyszukajPrzesylki' expects parameter '@Nazwisko', which was not supplied.
What am I doing wrong? Store procedure works if I test it in SSMS ...
It even works when I type
 SqlCommand com = new SqlCommand("WyszukajPrzesylki @Nazwisko = Example", con);
You are my last hope guys... I've already lost 2 days with this problem and cannot get any further... don't have any problems with inserting and updating records using c# ... just this....
So here is the code of SP
ALTER PROCEDURE [dbo].[WyszukajPrzesylki] 
	-- Add the parameters for the stored procedure here
	@Nazwisko varchar(50)
	-- SET NOCOUNT ON added to prevent extra result sets from
	-- interfering with SELECT statements.
    -- Insert statements for procedure here
	-- SELECT * FROM Przesylki WHERE (NazwiskoAdresata = @NazwiskoAdresata)
	SELECT * FROM Przesylki WHERE (Przesylki.NazwiskoAdresata = @Nazwisko)

and action of the button:

  SqlConnection con = new SqlConnection(Properties.Settings.Default.Monitoring_PrzesylekString1);
            SqlCommand com = new SqlCommand("WyszukajPrzesylki", con);
            com.CommandType = CommandType.StoredProcedure;
            SqlParameter parametrNazwisko = new SqlParameter("@Nazwisko", SqlDbType.VarChar, 50);
            parametrNazwisko.Value = "Dziubak";
            SqlDataAdapter ad = new SqlDataAdapter(com.CommandText, con);
            DataSet ds = new DataSet();
            ad.Fill(ds, "id");
            DataTable datatableA = ds.Tables[0];
            dataGridView1.DataSource = ds;
            dataGridView1.DataMember = "id";
Posted 14-Dec-12 8:54am
Aelion at 14-Dec-12 14:58pm
Why I cannot pass parameter using parametrNazwisko.Value = "Dziubak"; ? Any ideas?
__TR__ at 14-Dec-12 15:02pm
Try com.Parameters.Add(new SqlParameter("@Nazwisko", "Dziubak"));
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Solution 3

I found problem solution!
I should pass whole command parameter like this
  SqlDataAdapter ad = new SqlDataAdapter(com);
not just com.CommandText ... it was stupid.... but I lost so much time...
OriginalGriff at 14-Dec-12 15:23pm
Not stupid, just annoying. We all make mistakes! You get my five for posting the solution.
Aelion at 14-Dec-12 15:55pm
Thank you... thats my first "five" on this website ;-)
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Solution 2

From this sample C# SqlParameter[^] it looks like you should use
SqlParameter parametrNazwisko = new SqlParameter("Nazwisko", SqlDbType.VarChar, 50);
in stead off
SqlParameter parametrNazwisko = new SqlParameter("@Nazwisko", SqlDbType.VarChar, 50);
So remove the '@' from the parameter name.
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Solution 4

since you are using the stored procedure as the SQL statement you dont need to pass the parameter name with @ symbol just pass the name of the parameter SQL will do the rest.
SqlParameter parametrNazwisko = new SqlParameter("Nazwisko", "Dziubak"); 

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