insert into table fro, grid

hi there ,

i have a grid that is bind to dataset by code only
when the Form is load this is the code that perfromed :

DataSet ds = new DataSet();
            SqlDataAdapter ad;
            SqlConnection Con = new SqlConnection();
            private void CourseTav_Load(object sender, System.EventArgs e)
            {
                  Con.ConnectionString=BL.Conn.ConnString();
                  ad = new SqlDataAdapter("Select * from Course",Con);
                  ad.Fill(ds);

                  gridEX1.DataSource=ds;
                  gridEX1.DataMember=ds.Tables[0].ToString();
                  gridEX1.RetrieveStructure();

                  gridEX1.RootTable.Columns.RemoveAt(0);
                  
                  gridEX1.RootTable.Columns["CourseNum"].Caption="מס' קורס";
                  gridEX1.RootTable.Columns["CourseNum"].Width=90;

                  gridEX1.RootTable.Columns["CourseName"].Caption="שם קורס";
                  gridEX1.RootTable.Columns["CourseName"].Width=160;
                              
            }
now i want to insert row in the grid and click the update buuton

this is the code of the bottun :

SqlCommand cmdIns = new SqlCommand("INSERT INTO Course (CourseNum,CourseName) VALUES  (@Cnum,@Cname)",Con);

                                          
                        SqlParameter parm = new SqlParameter("@Cnum",SqlDbType.VarChar,50);
                        parm.Direction=ParameterDirection.Input;
                        parm.SourceVersion=DataRowVersion.Current;
                  
                        SqlParameter parm1 = new SqlParameter("@Cname",SqlDbType.VarChar,50);
                        parm1.Direction=ParameterDirection.Input;
                        parm1.SourceVersion=DataRowVersion.Current;
                        
                        cmdIns.Parameters.Clear();
                        cmdIns.Parameters.Add(parm);
                        cmdIns.Parameters.Add(parm1);

                        ad.InsertCommand.Connection=Con;
                        ad.InsertCommand.CommandText=cmdIns.CommandText;
                        ad.Update(ds);
i am geeting this Exsption :

Object reference not set to an instance of an object.

what do i need to do to insert row  ?
thanks....
Tech_MenAsked:
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sumixConnect With a Mentor Commented:
You didn't create an instance for ad.InsertCommand, you need to set this like:

ad.InsertCommand = cmdIns;
     (the error appears when you try to set connection and commandtext and the InsertCommand is null)
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Tech_MenAuthor Commented:
great thanks....
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