Events in customTextBox.

CustomComponents/DropList.Designer.cs

@@ -34,20 +34,22 @@
             // listBox
             // 
             listBox.FormattingEnabled = true;
-            listBox.ItemHeight = 20;
+            listBox.ItemHeight = 15;
-            listBox.Location = new Point(13, 12);
+            listBox.Location = new Point(11, 9);
+            listBox.Margin = new Padding(3, 2, 3, 2);
             listBox.Name = "listBox";
-            listBox.Size = new Size(150, 104);
+            listBox.Size = new Size(132, 79);
             listBox.TabIndex = 0;
-            listBox.SelectedValueChanged += 
+            listBox.SelectedValueChanged += SelectedValue_Changed;
             // 
             // Frame
             // 
-            AutoScaleDimensions = new SizeF(8F, 20F);
+            AutoScaleDimensions = new SizeF(7F, 15F);
             AutoScaleMode = AutoScaleMode.Font;
             Controls.Add(listBox);
+            Margin = new Padding(3, 2, 3, 2);
             Name = "Frame";
-            Size = new Size(189, 136);
+            Size = new Size(165, 103);
             ResumeLayout(false);
         }
 

CustomComponents/DropList.cs

@@ -3,21 +3,10 @@
     public partial class Frame : UserControl
     {
 
-        private event EventHandler? _valueChanged;
 
         private string? SelectedValue = string.Empty;
 
-        public event EventHandler ValueChanged
+        public event EventHandler ValueChanged;
-        {
-            add
-            {
-                _valueChanged += value;
-            }
-            remove
-            {
-                _valueChanged -= value;
-            }
-        }
 
         public Frame()
         {
@@ -42,6 +31,10 @@
         {
             get
             {
+                if (listBox.SelectedItem is null)
+                {
+                    return "";
+                }
                 return SelectedValue;
             }
             set
@@ -54,7 +47,7 @@
         {
             var element = sender as ListBox;
             Value = element.Text.ToString();
-            _valueChanged?.Invoke(this, e);
+            ValueChanged?.Invoke(this, e);
         }
     }
 }

CustomComponents/DropList.resx

@@ -1,64 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<root>
-<root>
-  <!--
-    Microsoft ResX Schema 
-
-    Version 2.0
-
-    The primary goals of this format is to allow a simple XML format
-    that is mostly human readable. The generation and parsing of the
-    various data types are done through the TypeConverter classes
-    associated with the data types.
-
-    Example:
-
-    ... ado.net/XML headers & schema ...
-    <resheader name="resmimetype">text/microsoft-resx</resheader>
-    <resheader name="version">2.0</resheader>
-    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
-    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
-    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
-    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
-    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
-        <value>[base64 mime encoded serialized .NET Framework object]</value>
-    </data>
-    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
-        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
-        <comment>This is a comment</comment>
-    </data>
-
-    There are any number of "resheader" rows that contain simple
-    name/value pairs.
-
-    Each data row contains a name, and value. The row also contains a
-    type or mimetype. Type corresponds to a .NET class that support
-    text/value conversion through the TypeConverter architecture.
-    Classes that don't support this are serialized and stored with the
-    mimetype set.
-
-    The mimetype is used for serialized objects, and tells the
-    ResXResourceReader how to depersist the object. This is currently not
-    extensible. For a given mimetype the value must be set accordingly:
-
-    Note - application/x-microsoft.net.object.binary.base64 is the format
-    that the ResXResourceWriter will generate, however the reader can
-    read any of the formats listed below.
-
-    mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with
-            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
-            : and then encoded with base64 encoding.
-    
-    mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with
-            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
-            : and then encoded with base64 encoding.
-
-    mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array
-            : using a System.ComponentModel.TypeConverter
-            : and then encoded with base64 encoding.
-    -->
   <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
     <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
     <xsd:element name="root" msdata:IsDataSet="true">

CustomComponents/Exceptions/ContentException.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CustomComponents.Exceptions
+{
+    public class ContentException : Exception
+    {
+        public ContentException(bool state) : base(CustomMessage(state)){ }
+
+        private static string CustomMessage(bool state)
+        {
+            if(state)
+            {
+                return "TextBox is empty however null flag is checked.";
+            }
+
+            return "TextBox is empty. You better write something!";
+        }
+
+    }
+}

CustomComponents/Exceptions/NotIntegerException.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace CustomComponents.Exceptions
+{
+    public class NotIntegerException : Exception
+    {
+        public NotIntegerException() { }
+
+        public NotIntegerException(string message) : base(new string($"{message} is not an integer!")) { }
+    }
+}

CustomComponents/TextBox.cs

@@ -1,4 +1,5 @@
-using System;
+using CustomComponents.Exceptions;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.Data;
@@ -13,6 +14,9 @@ namespace CustomComponents
     public partial class frameTextBox : UserControl
     {
         private string? _text;
+
+        public event EventHandler taskHandler;
+
         public frameTextBox()
         {
             InitializeComponent();
@@ -31,13 +35,16 @@ namespace CustomComponents
         }
 
         private void CheckBoxStateChanged(object sender, EventArgs e)
+        {
+            try
             {
                 if (ruleCheckBox.Checked)
                 {
                     textBox.Enabled = false;
+
                     if (!string.IsNullOrEmpty(_text))
                     {
-                    MessageBox.Show("TextBox is not empty!");
+                        throw new ContentException(true);
                     }
                 }
                 else
@@ -45,10 +52,17 @@ namespace CustomComponents
                     textBox.Enabled = true;
                     if (string.IsNullOrEmpty(_text))
                     {
-                    MessageBox.Show("TextBox is empty. You better write something!");
+                        throw new ContentException(false);
                     }
                 }
             }
+            catch(ContentException ex)
+            {
+                taskHandler += (sender, e) => MessageBox.Show(ex.Message);
+            }
+            taskHandler?.Invoke(this, e);
+            
+        }
 
         private void CheckTextBoxValueType(object sender, EventArgs args)
         {

TestForms/Form1.Designer.cs

@@ -36,9 +36,10 @@
             // 
             // fillButton
             // 
-            fillButton.Location = new Point(175, 18);
+            fillButton.Location = new Point(153, 14);
+            fillButton.Margin = new Padding(3, 2, 3, 2);
             fillButton.Name = "fillButton";
-            fillButton.Size = new Size(94, 29);
+            fillButton.Size = new Size(82, 22);
             fillButton.TabIndex = 1;
             fillButton.Text = "FILL";
             fillButton.UseVisualStyleBackColor = true;
@@ -46,9 +47,10 @@
             // 
             // clearButton
             // 
-            clearButton.Location = new Point(175, 75);
+            clearButton.Location = new Point(153, 56);
+            clearButton.Margin = new Padding(3, 2, 3, 2);
             clearButton.Name = "clearButton";
-            clearButton.Size = new Size(94, 29);
+            clearButton.Size = new Size(82, 22);
             clearButton.TabIndex = 2;
             clearButton.Text = "CLEAR";
             clearButton.UseVisualStyleBackColor = true;
@@ -57,28 +59,31 @@
             // listBox
             // 
             listBox.Location = new Point(-3, 0);
+            listBox.Margin = new Padding(3, 2, 3, 2);
             listBox.Name = "listBox";
-            listBox.Size = new Size(172, 137);
+            listBox.Size = new Size(150, 120);
             listBox.TabIndex = 3;
             listBox.Value = "";
             // 
             // frameTextBox1
             // 
-            frameTextBox1.Location = new Point(312, 18);
+            frameTextBox1.Location = new Point(273, 14);
+            frameTextBox1.Margin = new Padding(3, 2, 3, 2);
             frameTextBox1.Name = "frameTextBox1";
-            frameTextBox1.Size = new Size(291, 91);
+            frameTextBox1.Size = new Size(255, 68);
             frameTextBox1.TabIndex = 4;
             frameTextBox1.Value = null;
             // 
             // TestFrame
             // 
-            AutoScaleDimensions = new SizeF(8F, 20F);
+            AutoScaleDimensions = new SizeF(7F, 15F);
             AutoScaleMode = AutoScaleMode.Font;
-            ClientSize = new Size(800, 450);
+            ClientSize = new Size(700, 338);
             Controls.Add(frameTextBox1);
             Controls.Add(clearButton);
             Controls.Add(fillButton);
             Controls.Add(listBox);
+            Margin = new Padding(3, 2, 3, 2);
             Name = "TestFrame";
             Text = "Form1";
             ResumeLayout(false);

TestForms/Form1.cs

@@ -6,7 +6,6 @@ namespace TestForms
         public TestFrame()
         {
             InitializeComponent();
-            listBox.ValueChanged += new EventHandler()
         }
 
         private void clearButton_Click(object sender, EventArgs e)
@@ -17,7 +16,6 @@ namespace TestForms
         private void fillButton_Click(object sender, EventArgs e)
         {
             listBox.PopulateList(new List<string> { "SILENT", "RIZZ", "BLSSDY", "YUEEJKE" });
-            
         }
 
 

TestForms/Form1.resx

@@ -1,64 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<root>
-<root>
-  <!--
-    Microsoft ResX Schema 
-
-    Version 2.0
-
-    The primary goals of this format is to allow a simple XML format
-    that is mostly human readable. The generation and parsing of the
-    various data types are done through the TypeConverter classes
-    associated with the data types.
-
-    Example:
-
-    ... ado.net/XML headers & schema ...
-    <resheader name="resmimetype">text/microsoft-resx</resheader>
-    <resheader name="version">2.0</resheader>
-    <resheader name="reader">System.Resources.ResXResourceReader, System.Windows.Forms, ...</resheader>
-    <resheader name="writer">System.Resources.ResXResourceWriter, System.Windows.Forms, ...</resheader>
-    <data name="Name1"><value>this is my long string</value><comment>this is a comment</comment></data>
-    <data name="Color1" type="System.Drawing.Color, System.Drawing">Blue</data>
-    <data name="Bitmap1" mimetype="application/x-microsoft.net.object.binary.base64">
-        <value>[base64 mime encoded serialized .NET Framework object]</value>
-    </data>
-    <data name="Icon1" type="System.Drawing.Icon, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
-        <value>[base64 mime encoded string representing a byte array form of the .NET Framework object]</value>
-        <comment>This is a comment</comment>
-    </data>
-
-    There are any number of "resheader" rows that contain simple
-    name/value pairs.
-
-    Each data row contains a name, and value. The row also contains a
-    type or mimetype. Type corresponds to a .NET class that support
-    text/value conversion through the TypeConverter architecture.
-    Classes that don't support this are serialized and stored with the
-    mimetype set.
-
-    The mimetype is used for serialized objects, and tells the
-    ResXResourceReader how to depersist the object. This is currently not
-    extensible. For a given mimetype the value must be set accordingly:
-
-    Note - application/x-microsoft.net.object.binary.base64 is the format
-    that the ResXResourceWriter will generate, however the reader can
-    read any of the formats listed below.
-
-    mimetype: application/x-microsoft.net.object.binary.base64
-    value   : The object must be serialized with
-            : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
-            : and then encoded with base64 encoding.
-    
-    mimetype: application/x-microsoft.net.object.soap.base64
-    value   : The object must be serialized with
-            : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
-            : and then encoded with base64 encoding.
-
-    mimetype: application/x-microsoft.net.object.bytearray.base64
-    value   : The object must be serialized into a byte array
-            : using a System.ComponentModel.TypeConverter
-            : and then encoded with base64 encoding.
-    -->
   <xsd:schema id="root" xmlns="" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:msdata="urn:schemas-microsoft-com:xml-msdata">
     <xsd:import namespace="http://www.w3.org/XML/1998/namespace" />
     <xsd:element name="root" msdata:IsDataSet="true">