Procedure or Function 'GroupSelect_All' expects parameter '@id', which was not supplied.

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SQL-Server-2005

C#3.0

C#

, +

Globali GB17=new Globali();

public DataSet Selectall(int id)
{
    //Create and open new sql connection
    SqlConnection Gconn = new SqlConnection(GB17.autocreateconn());
    Gconn.Open();
    string Gstname = "GroupSelect_All";
    SqlCommand Gcomand1 = new SqlCommand(Gstname, Gconn);
    Gcomand1.CommandType = CommandType.StoredProcedure;
    Gcomand1.Parameters.Add("@id", SqlDbType.Int).Value = id;
    SqlDataAdapter Gda = new SqlDataAdapter(Gstname, Gconn);
    DataSet Gds = new DataSet();
            
    Gda.Fill(Gds, "lms_group");
            
    return Gds;
    //connection closed
    Gconn.Close();
  }

all things are correct wat i dont understand why exception comes
the exception is
"Procedure or Function 'GroupSelect_All' expects parameter '@id', which was not supplied."

stored procedure is executed correctly and during debugging value also passed of parameter
but exception arises