Add project files.

Nutrition/formUpdNutrition.xaml.cs

@@ -0,0 +1,54 @@
+using System.Windows;
+using Npgsql;
+
+namespace SportsTrainingApp.Nutrition
+{
+    /// <summary>
+    /// Interaction logic for formUpdNutrition.xaml
+    /// </summary>
+    public partial class formUpdNutrition : Window
+    {
+        formNutrition.Nutrition item;
+        public formUpdNutrition(formNutrition.Nutrition _item)
+        {
+            InitializeComponent();
+            item = _item;
+            FillFormFields(item);
+        }
+
+        private void FillFormFields(formNutrition.Nutrition _item)
+        {
+            dtPicker.SelectedDate = _item.Date;
+            tbCalories.Text = _item.Calories.ToString();
+            tbCarbs.Text = _item.Carbs.ToString();
+            tbProtein.Text = _item.Protein.ToString();
+            tbFats.Text = _item.Fats.ToString();
+        }
+
+        private void Button_Click_2(object sender, RoutedEventArgs e)
+        {
+            this.Close();
+        }
+
+        private void Button_Click_1(object sender, RoutedEventArgs e)
+        {
+            using (var conn = new NpgsqlConnection(formMain.connectionString))
+            {
+                conn.Open();
+                using (var cmd = new NpgsqlCommand(@$"UPDATE dbo.nutrition 
+                        SET user_id=@user_id, date=@date, calories=@calories, protein=@protein, carbs=@carbs, fats=@fats
+	                    WHERE id = {item.ID};", conn))
+                {
+                    cmd.Parameters.AddWithValue("user_id", item.User_id);
+                    cmd.Parameters.AddWithValue("date", dtPicker.SelectedDate.Value);
+                    cmd.Parameters.AddWithValue("calories", Convert.ToInt32(tbCalories.Text));
+                    cmd.Parameters.AddWithValue("protein", Convert.ToDouble(tbProtein.Text));
+                    cmd.Parameters.AddWithValue("carbs", Convert.ToDouble(tbCarbs.Text));
+                    cmd.Parameters.AddWithValue("fats", Convert.ToDouble(tbFats.Text));
+                    cmd.ExecuteNonQuery();
+                }
+            }
+            this.Close();
+        }
+    }
+}