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               "RelativeDocumentMoniker": "PayrollSystem\\form_dashboard.cs",
               "ToolTip": "C:\\Users\\warlock\\source\\repos\\PayrollSystem\\PayrollSystem\\form_dashboard.cs [Design]",
               "RelativeToolTip": "PayrollSystem\\form_dashboard.cs [Design]",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2024-08-25T05:38:00.048Z"
+              "WhenOpened": "2024-08-25T05:38:00.048Z",
+              "EditorCaption": " [Design]"
             },
             {
               "$type": "Document",
-              "DocumentIndex": 9,
+              "DocumentIndex": 14,
-              "Title": "form_main.cs [Design]",
-              "DocumentMoniker": "C:\\Users\\warlock\\source\\repos\\PayrollSystem\\PayrollSystem\\form_main.cs",
-              "RelativeDocumentMoniker": "PayrollSystem\\form_main.cs",
-              "ToolTip": "C:\\Users\\warlock\\source\\repos\\PayrollSystem\\PayrollSystem\\form_main.cs [Design]",
-              "RelativeToolTip": "PayrollSystem\\form_main.cs [Design]",
-              "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2024-08-25T05:32:49.675Z"
-            },
-            {
-              "$type": "Document",
-              "DocumentIndex": 10,
               "Title": "Form1.cs [Design]",
               "DocumentMoniker": "C:\\Users\\warlock\\source\\repos\\PayrollSystem\\PayrollSystem\\Form1.cs",
               "RelativeDocumentMoniker": "PayrollSystem\\Form1.cs",
               "ToolTip": "C:\\Users\\warlock\\source\\repos\\PayrollSystem\\PayrollSystem\\Form1.cs [Design]",
               "RelativeToolTip": "PayrollSystem\\Form1.cs [Design]",
               "Icon": "ae27a6b0-e345-4288-96df-5eaf394ee369.000738|",
-              "WhenOpened": "2024-08-25T05:21:39.964Z"
+              "WhenOpened": "2024-08-25T05:21:39.964Z",
+              "EditorCaption": " [Design]"
             }
           ]
         }

PayrollSystem/form_departments.Designer.cs

@@ -29,14 +29,14 @@
         private void InitializeComponent()
         {
             this.list_departments = new System.Windows.Forms.ListView();
-            this.btnAdd = new System.Windows.Forms.Button();
-            this.btnEdit = new System.Windows.Forms.Button();
-            this.btnRemove = new System.Windows.Forms.Button();
-            this.btnShowEmployees = new System.Windows.Forms.Button();
             this.col_ID = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.col_Name = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.col_basic = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
             this.col_employees = ((System.Windows.Forms.ColumnHeader)(new System.Windows.Forms.ColumnHeader()));
+            this.btnAdd = new System.Windows.Forms.Button();
+            this.btnEdit = new System.Windows.Forms.Button();
+            this.btnRemove = new System.Windows.Forms.Button();
+            this.btnShowEmployees = new System.Windows.Forms.Button();
             this.SuspendLayout();
             // 
             // list_departments
@@ -55,6 +55,26 @@
             this.list_departments.TabIndex = 0;
             this.list_departments.UseCompatibleStateImageBehavior = false;
             this.list_departments.View = System.Windows.Forms.View.Details;
+            this.list_departments.SelectedIndexChanged += new System.EventHandler(this.list_departments_SelectedIndexChanged);
+            // 
+            // col_ID
+            // 
+            this.col_ID.Text = "ID";
+            // 
+            // col_Name
+            // 
+            this.col_Name.Text = "Name";
+            this.col_Name.Width = 284;
+            // 
+            // col_basic
+            // 
+            this.col_basic.Text = "Basic";
+            this.col_basic.Width = 194;
+            // 
+            // col_employees
+            // 
+            this.col_employees.Text = "Employee Count";
+            this.col_employees.Width = 135;
             // 
             // btnAdd
             // 
@@ -75,6 +95,7 @@
             this.btnEdit.TabIndex = 2;
             this.btnEdit.Text = "Edit selected Department";
             this.btnEdit.UseVisualStyleBackColor = true;
+            this.btnEdit.Click += new System.EventHandler(this.btnEdit_Click);
             // 
             // btnRemove
             // 
@@ -85,6 +106,7 @@
             this.btnRemove.TabIndex = 3;
             this.btnRemove.Text = "Remove selected Department";
             this.btnRemove.UseVisualStyleBackColor = true;
+            this.btnRemove.Click += new System.EventHandler(this.btnRemove_Click);
             // 
             // btnShowEmployees
             // 
@@ -96,25 +118,6 @@
             this.btnShowEmployees.UseVisualStyleBackColor = true;
             this.btnShowEmployees.Click += new System.EventHandler(this.btnShowEmployees_Click);
             // 
-            // col_ID
-            // 
-            this.col_ID.Text = "ID";
-            // 
-            // col_Name
-            // 
-            this.col_Name.Text = "Name";
-            this.col_Name.Width = 284;
-            // 
-            // col_basic
-            // 
-            this.col_basic.Text = "Basic";
-            this.col_basic.Width = 194;
-            // 
-            // col_employees
-            // 
-            this.col_employees.Text = "Employee Count";
-            this.col_employees.Width = 135;
-            // 
             // form_departments
             // 
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);

PayrollSystem/form_departments.cs

@@ -13,14 +13,18 @@ namespace PayrollSystem
 {
     public partial class form_departments : Form
     {
-        public form_departments()
+        form_main mainForm;
+
+        public form_departments(form_main main)
         {
             InitializeComponent();
+            mainForm= main;
         }
 
         private void form_departments_Load(object sender, EventArgs e)
         {
             Search();
+            RefreshUI();
         }
 
 
@@ -72,7 +76,85 @@ namespace PayrollSystem
 
         private void btnShowEmployees_Click(object sender, EventArgs e)
         {
+            RefreshUI();
+            if (!isSelectedItem) { return; }
 
+            mainForm.ShowEmployeesOnDepartment(list_departments.SelectedItems[0].SubItems[1].Text);
+        }
+
+        private void btnEdit_Click(object sender, EventArgs e)
+        {
+            RefreshUI();
+            if (!isSelectedItem) { return; }
+
+            form_modify_department editForm = new form_modify_department(int.Parse(list_departments.SelectedItems[0].Text));
+            editForm.ShowDialog();
+
+            Search();
+        }
+        bool isSelectedItem => list_departments.SelectedItems.Count > 0;
+        void RefreshUI()
+        {
+            btnEdit.Enabled = btnRemove.Enabled = btnShowEmployees.Enabled = isSelectedItem;
+        }
+
+        private void list_departments_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            RefreshUI();
+        }
+
+        private void btnRemove_Click(object sender, EventArgs e)
+        {
+            RefreshUI();
+            if (!isSelectedItem) { return; }
+            
+            string selectedID = list_departments.SelectedItems[0].Text;
+
+            DialogResult confirmation = MessageBox.Show("Are you sure to remove this department? This will cause all the employees in this department to be removed!", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
+            if (confirmation == DialogResult.Yes)
+            {
+                List<string> affectedEmployees = new List<string>();
+                using (SqlConnection con = new SqlConnection(Helpers.conString))
+                {
+                    con.Open();
+                    using (SqlCommand cmd = new SqlCommand("SELECT Name FROM Employees WHERE Department_ID=@id", con)) {
+                        cmd.Parameters.AddWithValue("@id", selectedID);
+                        using (SqlDataReader reader = cmd.ExecuteReader())
+                        {
+                            while (reader.Read()) {
+                                affectedEmployees.Add(reader["Name"].ToString());
+                            }
+                        }
+                    }
+
+                    string msg = "These are the list of employees that will be removed with this operation\n";
+                    foreach (string employee in affectedEmployees)
+                    {
+                        msg += $"\n{employee}";
+                    }
+
+                    DialogResult finalConfirmation = MessageBox.Show(msg, "Are you still sure?", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
+                    if (finalConfirmation == DialogResult.Yes)
+                    {
+                        using (SqlCommand cmd = new SqlCommand("DELETE FROM Employees WHERE Department_ID=@id", con))
+                        {
+                            cmd.Parameters.AddWithValue("@id", selectedID);
+
+                            int result = cmd.ExecuteNonQuery();
+                        }
+
+                        using (SqlCommand cmd = new SqlCommand("DELETE FROM Departments WHERE ID=@id", con))
+                        {
+                            cmd.Parameters.AddWithValue("@id", selectedID);
+
+                            int result = cmd.ExecuteNonQuery();
+                        }
+                    }
+                    con.Close();
+                }
+
+                Search();
+            }
         }
     }
 }

PayrollSystem/form_employees.cs

@@ -13,7 +13,7 @@ namespace PayrollSystem
 {
     public partial class form_employees : Form
     {
-        public form_employees()
+        public form_employees(string departmentName = "")
         {
             InitializeComponent();
             combo_date_type.SelectedIndex = 0;
@@ -35,7 +35,21 @@ namespace PayrollSystem
                 connection.Close();
             }
 
-            combo_department.SelectedIndex = 0;
+            if (departmentName != "")
+            {
+                for (int i = 0; i < combo_department.Items.Count; i++)
+                {
+                    if (departmentName == combo_department.Items[i].ToString())
+                    {
+                        combo_department.SelectedIndex = i;
+                        break;
+                    }
+                }
+            }
+            else
+            {
+                combo_department.SelectedIndex = 0;
+            }
         }
 
         private void dateTimePicker1_ValueChanged(object sender, EventArgs e)
@@ -75,7 +89,7 @@ namespace PayrollSystem
                 //Prepare the WHERE Clauses
                 List<string> clauses = new List<string>();
                 if(txtID.Text.Length > 0) { clauses.Add($"Employees.ID={txtID.Text}"); }
-                if (txtName.Text.Length > 0) { clauses.Add($"Employees.Name='%{txtName.Text}%'"); }
+                if (txtName.Text.Length > 0) { clauses.Add($"Employees.Name LIKE '%{txtName.Text}%'"); }
 
                 if(combo_date_type.SelectedItem.ToString() != "Anytime") {
                     string condition = "=";

PayrollSystem/form_main.cs

@@ -12,6 +12,17 @@ namespace PayrollSystem
 {
     public partial class form_main : Form
     {
+
+        public void ShowEmployeesOnDepartment(string id)
+        {
+            form_employees employees = new form_employees(id);
+            employees.TopLevel = false;
+            employees.AutoScroll = true;
+            panel1.Controls.Clear();
+            panel1.Controls.Add(employees);
+            employees.Show();
+        }
+
         public form_main()
         {
             InitializeComponent();
@@ -44,7 +55,7 @@ namespace PayrollSystem
 
         private void btn_departments_Click(object sender, EventArgs e)
         {
-            form_departments deparments = new form_departments();
+            form_departments deparments = new form_departments(this);
             deparments.TopLevel = false;
             deparments.AutoScroll = true;
             panel1.Controls.Clear();

PayrollSystem/form_modify_department.cs

@@ -25,6 +25,28 @@ namespace PayrollSystem
         {
             Text = isEditing ? "Edit Department" : "Add new Department";
             btnAdd.Text = isEditing ? "Edit" : "Add";
+
+            if (isEditing)
+            {
+                using(SqlConnection con = new SqlConnection(Helpers.conString))
+                {
+                    con.Open();
+                    using (SqlCommand cmd= new SqlCommand("SELECT * FROM Departments WHERE ID=@id", con))
+                    {
+                        cmd.Parameters.AddWithValue("@id", editingId);
+
+                        using(SqlDataReader reader = cmd.ExecuteReader())
+                        {
+                            while (reader.Read())
+                            {
+                                txtName.Text = reader["Name"].ToString();
+                                txtBasic.Text = reader["Basic"].ToString();
+                            }
+                        }
+                    }
+                    con.Close();
+                }
+            }
         }
 
         private void btnAdd_Click(object sender, EventArgs e)
@@ -46,30 +68,26 @@ namespace PayrollSystem
             }
 
 
-            if (isEditing)
-            {
-
-            }
-            else
-            {
-                Insert();
-            }
-        }
-
-        void Insert()
-        {
             using (SqlConnection con = new SqlConnection(Helpers.conString))
             {
                 con.Open();
-                using (SqlCommand cmd = new SqlCommand("INSERT INTO Departments (Name, Basic) VALUES(@name,@basic)", con))
+                string query = "INSERT INTO Departments (Name, Basic) VALUES(@name,@basic)";
+                if (isEditing)
                 {
+                    query = "UPDATE Departments SET Name=@name, Basic=@basic WHERE ID=@id";
+                }
+                using (SqlCommand cmd = new SqlCommand(query, con))
+                {
+                    if (isEditing) {
+                        cmd.Parameters.AddWithValue("@id", editingId);
+                    }
                     cmd.Parameters.AddWithValue("@name", txtName.Text);
                     cmd.Parameters.AddWithValue("@basic", txtBasic.Text);
 
                     int result = cmd.ExecuteNonQuery();
                     if (result < 0)
                     {
-                        MessageBox.Show("There was an error adding new department", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
+                        MessageBox.Show($"There was an error {(isEditing ? "editing" : "adding new")} Department", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                     }
                 }
                 con.Close();
@@ -77,6 +95,7 @@ namespace PayrollSystem
             this.Close();
         }
 
+
         private void btn_cancel_Click(object sender, EventArgs e)
         {
             this.Close();