Правочка

CarRepairShop/CarRepairShopView/FormClients.Designer.cs

@@ -30,6 +30,7 @@
         {
             dataGridView = new DataGridView();
             buttonDel = new Button();
+            buttonRef = new Button();
             ((System.ComponentModel.ISupportInitialize)dataGridView).BeginInit();
             SuspendLayout();
             // 
@@ -59,11 +60,22 @@
             buttonDel.UseVisualStyleBackColor = true;
             buttonDel.Click += buttonDel_Click;
             // 
+            // buttonRef
+            // 
+            buttonRef.Location = new Point(624, 68);
+            buttonRef.Name = "buttonRef";
+            buttonRef.Size = new Size(152, 36);
+            buttonRef.TabIndex = 3;
+            buttonRef.Text = "Обновить";
+            buttonRef.UseVisualStyleBackColor = true;
+            buttonRef.Click += buttonRef_Click;
+            // 
             // FormClients
             // 
             AutoScaleDimensions = new SizeF(7F, 15F);
             AutoScaleMode = AutoScaleMode.Font;
             ClientSize = new Size(785, 450);
+            Controls.Add(buttonRef);
             Controls.Add(buttonDel);
             Controls.Add(dataGridView);
             Name = "FormClients";
@@ -77,5 +89,6 @@
 
         private DataGridView dataGridView;
         private Button buttonDel;
+        private Button buttonRef;
     }
 }

CarRepairShop/CarRepairShopView/FormClients.cs

@@ -74,5 +74,10 @@ namespace CarRepairShopView
                 }
             }
         }
+
+        private void buttonRef_Click(object sender, EventArgs e)
+        {
+            LoadData();
+        }
     }
 }