лучше

ProjectFlowerShop/FormCreateOrder.Designer.cs

@@ -36,6 +36,8 @@
             textBoxCount = new TextBox();
             comboBoxProduct = new ComboBox();
             textBoxSum = new TextBox();
+            comboBoxClient = new ComboBox();
+            labelClient = new Label();
             SuspendLayout();
             // 
             // labelProduct
@@ -59,7 +61,7 @@
             // LabelSum
             // 
             LabelSum.AutoSize = true;
-            LabelSum.Location = new Point(12, 113);
+            LabelSum.Location = new Point(15, 159);
             LabelSum.Name = "LabelSum";
             LabelSum.Size = new Size(55, 20);
             LabelSum.TabIndex = 2;
@@ -67,7 +69,7 @@
             // 
             // buttonSave
             // 
-            buttonSave.Location = new Point(292, 158);
+            buttonSave.Location = new Point(295, 222);
             buttonSave.Name = "buttonSave";
             buttonSave.Size = new Size(94, 29);
             buttonSave.TabIndex = 3;
@@ -77,7 +79,7 @@
             // 
             // buttonCancel
             // 
-            buttonCancel.Location = new Point(411, 158);
+            buttonCancel.Location = new Point(408, 222);
             buttonCancel.Name = "buttonCancel";
             buttonCancel.Size = new Size(94, 29);
             buttonCancel.TabIndex = 4;
@@ -104,18 +106,37 @@
             // 
             // textBoxSum
             // 
-            textBoxSum.Location = new Point(97, 110);
+            textBoxSum.Location = new Point(97, 156);
             textBoxSum.Name = "textBoxSum";
             textBoxSum.ReadOnly = true;
             textBoxSum.Size = new Size(274, 27);
             textBoxSum.TabIndex = 7;
             textBoxSum.TextChanged += textBox2_TextChanged;
             // 
+            // comboBoxClient
+            // 
+            comboBoxClient.FormattingEnabled = true;
+            comboBoxClient.Location = new Point(97, 112);
+            comboBoxClient.Name = "comboBoxClient";
+            comboBoxClient.Size = new Size(274, 28);
+            comboBoxClient.TabIndex = 8;
+            // 
+            // labelClient
+            // 
+            labelClient.AutoSize = true;
+            labelClient.Location = new Point(12, 115);
+            labelClient.Name = "labelClient";
+            labelClient.Size = new Size(58, 20);
+            labelClient.TabIndex = 9;
+            labelClient.Text = "Кол-во";
+            // 
             // FormCreateOrder
             // 
             AutoScaleDimensions = new SizeF(8F, 20F);
             AutoScaleMode = AutoScaleMode.Font;
-            ClientSize = new Size(514, 199);
+            ClientSize = new Size(514, 263);
+            Controls.Add(labelClient);
+            Controls.Add(comboBoxClient);
             Controls.Add(textBoxSum);
             Controls.Add(comboBoxProduct);
             Controls.Add(textBoxCount);
@@ -141,5 +162,7 @@
         private TextBox textBoxCount;
         private ComboBox comboBoxProduct;
         private TextBox textBoxSum;
+        private ComboBox comboBoxClient;
+        private Label labelClient;
     }
 }

ProjectFlowerShop/FormCreateOrder.cs

@@ -20,13 +20,15 @@ namespace ProjectFlowerShop
         private readonly ILogger _logger;
         private readonly IFlowerLogic _logicF;
         private readonly IOrderLogic _logicO;
+        private readonly IClientLogic _logicC;
 
-        public FormCreateOrder(ILogger<FormCreateOrder> logger, IFlowerLogic logicP, IOrderLogic logicO)
+        public FormCreateOrder(ILogger<FormCreateOrder> logger, IFlowerLogic logicP, IOrderLogic logicO, IClientLogic logicC)
         {
             InitializeComponent();
             _logger = logger;
             _logicF = logicP;
             _logicO = logicO;
+            _logicC = logicC;
         }
 
         private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
@@ -64,6 +66,26 @@ namespace ProjectFlowerShop
                 _logger.LogError(ex, "Ошибка загрузки цветов");
                 MessageBox.Show(ex.Message, "Ошибка", MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
+
+            _logger.LogInformation("Загрузка клиентов для заказа");
+            try
+            {
+                var list = _logicC.ReadList(null);
+                if (list != null)
+                {
+                    comboBoxClient.DisplayMember = "ClientFIO";
+                    comboBoxClient.ValueMember = "Id";
+                    comboBoxClient.DataSource = list;
+                    comboBoxClient.SelectedItem = null;
+                }
+                _logger.LogInformation("Клиенты загружены");
+            }
+            catch (Exception ex)
+            {
+                _logger.LogError(ex, "Ошибка загрузки клиентов");
+                MessageBox.Show(ex.Message, "Ошибка", MessageBoxButtons.OK,
+               MessageBoxIcon.Error);
+            }
         }
 
         private void CalcSum()
@@ -106,6 +128,12 @@ namespace ProjectFlowerShop
                MessageBoxButtons.OK, MessageBoxIcon.Error);
                 return;
             }
+            if (comboBoxClient.SelectedValue == null)
+            {
+                MessageBox.Show("Выберите клиента", "Ошибка",
+               MessageBoxButtons.OK, MessageBoxIcon.Error);
+                return;
+            }
             _logger.LogInformation("Создание заказа");
             try
             {
@@ -113,7 +141,8 @@ namespace ProjectFlowerShop
                 {
                     FlowerId = Convert.ToInt32(comboBoxProduct.SelectedValue),
                     Count = Convert.ToInt32(textBoxCount.Text),
-                    Sum = Convert.ToDouble(textBoxSum.Text)
+                    Sum = Convert.ToDouble(textBoxSum.Text),
+                    ClientId = Convert.ToInt32(comboBoxClient.SelectedValue),
                 });
                 if (!operationResult)
                 {

ProjectFlowerShop/Program.cs

@@ -40,10 +40,12 @@ namespace ProjectFlowerShop
             services.AddTransient<IComponentStorage, ComponentStorage>();
             services.AddTransient<IOrderStorage, OrderStorage>();
             services.AddTransient<IFlowerStorage, FlowerStorage>();
+            services.AddTransient<IClientStorage, ClientStorage>();
             services.AddTransient<IComponentLogic, ComponentLogic>();
             services.AddTransient<IOrderLogic, OrderLogic>();
             services.AddTransient<IFlowerLogic, FlowerLogic>();
             services.AddTransient<IReportLogic, ReportLogic>();
+            services.AddTransient<IClientLogic, ClientLogic>();
             services.AddTransient<MainForm>();
             services.AddTransient<ComponentForm>();
             services.AddTransient<FormComponents>();