TextBox with Browsable Properties (TextBox Mode)

Here below, I have created the TextBox control with browable properties (TextBox Mode: Alphabet only, Number only, Alphabet & Special Character and Number & Special Character)

To do this, Let me create an user control as below

My myTextBox user control's designer cs file code:

partial class myTextBox
{
    /// <summary> 
    /// Required designer variable.
    /// </summary>
    private System.ComponentModel.IContainer components = null;

    /// <summary> 
    /// Clean up any resources being used.
    /// </summary>
    /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }

    #region Component Designer generated code

    /// <summary> 
    /// Required method for Designer support - do not modify 
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {
        this.txtValue = new System.Windows.Forms.TextBox();
        this.SuspendLayout();
        // 
        // txtValue
        // 
        this.txtValue.Dock = System.Windows.Forms.DockStyle.Fill;
        this.txtValue.Location = new System.Drawing.Point(0, 0);
        this.txtValue.Multiline = true;
        this.txtValue.Name = "txtValue";
        this.txtValue.Size = new System.Drawing.Size(143, 21);
        this.txtValue.TabIndex = 0;
        this.txtValue.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtValue_KeyPress);
        // 
        // myTextBox
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.Controls.Add(this.txtValue);
        this.Name = "myTextBox";
        this.Size = new System.Drawing.Size(143, 21);
        this.ResumeLayout(false);
        this.PerformLayout();
    }

    #endregion

    private System.Windows.Forms.TextBox txtValue;
}

My myTextBox user control's code behind cs file code:

[ToolboxBitmap(typeof(DataGrid))]
public partial class myTextBox : UserControl
{
    TextBoxTypeSettings.Mode textBoxTypeSettings; //= new TextBoxTypeSettings();

    public myTextBox()
    {
        InitializeComponent();
    }

    [Browsable(true)]
    [EditorBrowsable(EditorBrowsableState.Always)]
    public TextBoxTypeSettings.Mode TextBoxType
    {
        get
        {
            return this.textBoxTypeSettings;
        }

        set
        {
            this.textBoxTypeSettings = value;
        }
    }

    private void txtValue_KeyPress(object sender, KeyPressEventArgs e)
    {
        switch (textBoxTypeSettings)
        {
            case TextBoxTypeSettings.Mode.AlphabetOnly:
                e.Handled = !(char.IsLetter(e.KeyChar) || e.KeyChar == (char)Keys.Back);
                break;
            case TextBoxTypeSettings.Mode.NumberOnly:
                if (!char.IsControl(e.KeyChar) && !char.IsDigit(e.KeyChar) && (e.KeyChar != '.'))
                {
                    e.Handled = true;
                }

                // only allow one decimal point
                if ((e.KeyChar == '.') && ((sender as TextBox).Text.IndexOf('.') > -1))
                {
                    e.Handled = true;
                }
                break;
        }
    }
}

My TextBoxTypeSettings class file:

[TypeConverter(typeof(TextBoxTypeSettingsConverter))]
public class TextBoxTypeSettings
{
    private Mode _TextBoxMode;

    [Serializable]
    public enum Mode
    {
        NumberOnly,
        AlphabetOnly
    }

    [Browsable(true)]
    [DefaultValue("")]
    [Description("Gets and sets the textbox's mode")]
    [NotifyParentProperty(true)]
    [EditorBrowsable(EditorBrowsableState.Always)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public Mode TextBoxMode
    {
        get
        {
            return _TextBoxMode;
        }
        set
        {
            _TextBoxMode = value;
        }
    }
}

My TextBoxTypeSettingsConverter class:

public class TextBoxTypeSettingsConverter : ExpandableObjectConverter
{
    // This override prevents the PropertyGrid from  
    // displaying the full type name in the value cell. 
    public override object ConvertTo(
        ITypeDescriptorContext context,
        CultureInfo culture,
        object value,
        Type destinationType)
    {
        if (destinationType == typeof(string))
        {
            return "";
        }

        return base.ConvertTo(
            context,
            culture,
            value,
            destinationType);
    }
}