visual studio C# 提示无法找到表 0

            string strConnection = "Data Source=.;Initial Catalog=CustomerDB1;Persist Security Info=True;User ID=sa;Password=123456;Pooling=False";
            SqlConnection objConnection = new SqlConnection(strConnection);
            objConnection.Open();

            string strCommand = "Select * From Customer";
            SqlCommand objCommad = new SqlCommand(strCommand, objConnection);

            DataSet objDataSet = new DataSet();
            SqlDataAdapter objAdapter = new SqlDataAdapter(objCommad);
            dtgCustomer.DataSource = objDataSet.Tables[0];
            objConnection.Close();

bug在 dtgCustomer.DataSource = objDataSet.Tables[0];