Search used as button to check marked persons

Form1.cs

@@ -22,22 +22,36 @@ namespace it_projekt
 
         private void searchBtn_Click(object sender, EventArgs e)
         {
+            foreach(DataGridViewRow row in dataGrid.Rows)
+            {
+                List<int> markedUsers = new List<int>();
+                if (row.Cells[4].Value != null)
+                {
+                    if (row.Cells[4].Value.ToString() == "True")
+                    {
+                        MessageBox.Show("geht");
+                    }
+                }
+                
+                
+            }
             
-            this.dataGrid.Rows.Add("test", "test", "test", "test", true);
-           // this.dataGrid.Rows.Contains();
         }
 
         private void loginBtn_Click(object sender, EventArgs e)
         {
-            LoadUsersFromTable("root","");
+            LoadUsersFromTable(userTxt.Text,passTxt.Text);
         }
 
 
 
-        public static void LoadUsersFromTable(string user, string password)
+        public void LoadUsersFromTable(string user, string password)
         {
             Database db = new Database(user, password);
-            MessageBox.Show(db.Persons.ToString());
+            foreach (Person person in db.Persons)
+            {
+                this.dataGrid.Rows.Add(person.Id, person.Firstname, person.Lastname, person.CreationDate, false);
+            }
         }
 
         private void dataGrid_CellContentClick(object sender, DataGridViewCellEventArgs e)