I need to send a parameter a null value to the procedure, but I get an error:
System.Data.SqlClient.SqlException: 'Procedure or function 'sel_mizanyeni' expects parameter '@subeno', which was not supplied.'

When I run the same procedure with the same parameters in SQL Server, it does not cause an error. When I run it with ADO.NET in C#, I get that error.

Running state in SQL Server:

exec sel_mizanyeni 
     @subeno=null,
     @tarih='2021-12-28 00:00:00',
     @kirilimlevel=8,
     @detaylevel=3,
     @hesap1=N'342',
     @hesap2=N'343',
     @dovizcinsi=0,
     @bakiyeverenler=1,
     @optnetbakiye=1,
     @optdisticsir=0,
     @opteval=0,
     @kurtarihi='2021-12-28 00:00:00',
     @yilsonu=0,
     @firmano=NULL,
     @ekno=NULL,
     @ikitariharasi=0,
     @bittarih='2021-12-28 00:00:00',
     @migration=1

This code is not working in C#:

SqlCommand cmd = new SqlCommand("sel_mizanyeni", baglanti);
cmd.CommandType = CommandType.StoredProcedure;

// I need to pass NULL here, but I get the mentioned error
cmd.Parameters.AddWithValue("@subeno", null);

cmd.Parameters.AddWithValue("@tarih", "2021-12-28 00:00:00");
cmd.Parameters.AddWithValue("@kirilimlevel", 8);
cmd.Parameters.AddWithValue("@detaylevel", 3);
cmd.Parameters.AddWithValue("@hesap1", "342");
cmd.Parameters.AddWithValue("@hesap2", "343");
cmd.Parameters.AddWithValue("@dovizcinsi", 0);
cmd.Parameters.AddWithValue("@bakiyeverenler", 1);
cmd.Parameters.AddWithValue("@optnetbakiye", 1);
cmd.Parameters.AddWithValue("@optdisticsir", 0);
cmd.Parameters.AddWithValue("@opteval", 0);
cmd.Parameters.AddWithValue("@kurtarihi", "2021-12-28 00:00:00");
cmd.Parameters.AddWithValue("@yilsonu", 0);

cmd.Parameters.AddWithValue("@firmano", null);
cmd.Parameters.AddWithValue("@ekno", null);

cmd.Parameters.AddWithValue("@ikitariharasi", 0);
cmd.Parameters.AddWithValue("@bittarih", "2021-12-28 00:00:00");
cmd.Parameters.AddWithValue("migration", 1);

SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);

dataGridView1.DataSource = ds.Tables[0];