Update DataTable - Error

Question

Hi,

I'm using C#2008
DB - Oracle11G

I have a problem while update data using Datatable.
Herewith i Attach my code. please check where I did mistake.


private void btnSave_Click(object sender, EventArgs e)
        {
            connectionString = "User Id=tom;Password=pwd4tom;Data Source=remote_oracle";
            cn = new OracleConnection(connectionString);


            OracleCommand command;
            string insertQuery = @"insert into employee(id, name, dept, address, active) Values 
                                 (@id, @name, @dept, @address, @active)";
            command = new OracleCommand(insertQuery, cn);
            command.Parameters.Add("@id", OracleDbType.Int16, 5, "id");
            command.Parameters.Add("@name", OracleDbType.Varchar2, 50, "name");
            command.Parameters.Add("@dept", OracleDbType.Varchar2, 3, "dept");
            command.Parameters.Add("@address", OracleDbType.Varchar2, 50, "address");
            command.Parameters.Add("@active", OracleDbType.Varchar2, 1, "active");
            adapter.InsertCommand = command;


            string updateQuery = @"update employee set name=@name, dept=@dept, address=@address, 
                        active=@active where id=@id";
            command = new OracleCommand(updateQuery, cn);
            command.Parameters.Add("@name", OracleDbType.Varchar2, 50, "name");
            command.Parameters.Add("@dept", OracleDbType.Varchar2, 3, "dept");
            command.Parameters.Add("@address", OracleDbType.Varchar2, 50, "address");
            command.Parameters.Add("@active", OracleDbType.Varchar2, 10, "active");
            OracleParameter param1 = command.Parameters.Add("@id", OracleDbType.Int16, 5, "id");
            param1.SourceVersion = DataRowVersion.Original;
            adapter.UpdateCommand = command;


            string deleteQuery = @"Delete employee where id=@id";
            command = new OracleCommand(deleteQuery, cn);
            OracleParameter paramd1 = command.Parameters.Add("@id", OracleDbType.Int16, 5, "id");
            paramd1.SourceVersion = DataRowVersion.Original;
            adapter.DeleteCommand = command;


            adapter.Update(empTbl); // What goes wrong here....
           
           
        }

thanks,
thenndral.