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See more: C# SQL stored-procedure
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 9:54am
Updated 18-Jul-16 23:47pm
Aelion 14-Dec-12 14:58pm
Why I cannot pass parameter using

parametrNazwisko.Value = "Dziubak";

? Any ideas?
__TR__ 14-Dec-12 15:02pm
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 14-Dec-12 15:23pm
Not stupid, just annoying. We all make mistakes!

You get my five for posting the solution.
Aelion 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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Solution 5

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