[C#] Validation class for events?

[gicio]

Hi,

I develop an application that have 20 windows forms with many TextBoxes.
All TextBoxes have the same validation...
I write in all classes the same validation like that:

		
		//if the user press a key down at txtDisplacement we check which one was pressed down
		#region KeyDownInTxtDisplacement code
		private void KeyDownInTxtDisplacement(object sender, System.Windows.Forms.KeyEventArgs e)
		{
			CheckWhichKeyDown(e);
		}
		#endregion



		//if the user press a key down at txtModel we check which one was pressed down
		#region KeyDownInTxtModel code
		private void KeyDownInTxtModel(object sender, System.Windows.Forms.KeyEventArgs e)
		{
			CheckWhichKeyDown(e);
		}
		#endregion



		//we check which key is pressed
		//if key Enter or Return or Tab is pressed
		//we go throw DoWhenOneTextBoxIsMarkedRed()
		#region CheckWhichKeyDown code
		private void CheckWhichKeyDown(System.Windows.Forms.KeyEventArgs e)
		{
			if(e.KeyCode==Keys.Enter || e.KeyCode==Keys.Return || e.KeyCode==Keys.Tab)
			{
				ValidateThis();
			}		
		}
		#endregion



		//when special key is press we enable the button
		#region ValidateThis code
		private void ValidateThis()
		{
			cmdAddToDataBase.Enabled = true;
		}
		#endregion

CheckWhichKeyDown and ValidateThis should be in one validation class.
How I can write a validation class that validate ALL TextBoxes from all classes.
Any ideas?
Or do you know some sample validation classes available on www?


gicio

[CornedBee]

Validation class?

Can't you simply derive a class from TextBox? It's not sealed.

[gicio]

Hi,

I write a new class... like this:

using System;
using System.Windows.Forms;
using System.Windows.Forms.ComponentModel;

namespace CarTrade
{
	/// <summary>
	/// Summary description for TestTextBox.
	/// </summary>
	public class TestTextBox : System.Windows.Forms.TextBox
	{
		private bool booOnlyNumericCharsAllowed;
		private bool booSpecialKeyIsPress;
		
		public TestTextBox.
		{
	
		}

		//---------------------------------------------------------------
		//---------------------------PROPERTIES--------------------------
		//---------------------------------------------------------------

		//we allowed in the TestTextBox only numeric chars
		//when the user set the proparty OnlyOnlyNumericCharsAllowed
		//to true
		internal bool OnlyNumericCharsAllowed
		{
			get
			{
				//return the value how OnlyOnlyNumericCharsAllowed
				//is set
				return booOnlyNumericCharsAllowed;
			}
			set
			{
				if(value)
				{
					this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.DoWhenKeyPress);
				}

				booOnlyNumericCharsAllowed = value;
			}
		}

		internal bool SpecialKeyIsPress
		{
			get
			{
				return booSpecialKeyIsPress;
			}
			set
			{
				if(value)
				{
					this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.CheckIfSpecialKeysArePressed);
				}

				booSpecialKeyIsPress = value;
			}
		}

		private void CheckIfSpecialKeysArePressed(object sender, System.Windows.Forms.KeyEventArgs e)
		{
			bool booEnter = e.KeyCode == Keys.Enter;
			bool booReturn = e.KeyCode==Keys.Return;
			bool booTab = e.KeyCode==Keys.Tab;

			if(booEnter || booReturn || booTab)
			{
		
			}
		}

		private void DoWhenKeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
		{
			if((e.KeyChar < 48 || e.KeyChar > 57) && e.KeyChar != 8 )
			{
				e.Handled = true;
			}

			if(Text.Length == 0 && e.KeyChar == 48)
			{
				e.Handled = true;
			}
		}

	}
}

Any coments are welcome!


gicio