using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace cs_KeyPress
{
	/// <summary>
	/// Form1 的摘要說明。
	/// </summary>
	public class Form1 : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.Label label2;
		private System.Windows.Forms.TextBox txtId;
		/// <summary>
		/// 必需的設計器變量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form1()
		{
			//
			// Windows 窗體設計器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 調用后添加任何構造函數代碼
			//
		}

		/// <summary>
		/// 清理所有正在使用的資源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows Form Designer generated code
		/// <summary>
		/// 設計器支持所需的方法 - 不要使用代碼編輯器修改
		/// 此方法的內容。
		/// </summary>
		private void InitializeComponent()
		{
			this.label1 = new System.Windows.Forms.Label();
			this.label2 = new System.Windows.Forms.Label();
			this.txtId = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// label1
			// 
			this.label1.BackColor = System.Drawing.Color.FromArgb(((System.Byte)(192)), ((System.Byte)(255)), ((System.Byte)(255)));
			this.label1.Font = new System.Drawing.Font("宋體", 15.75F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label1.Location = new System.Drawing.Point(56, 24);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(144, 23);
			this.label1.TabIndex = 0;
			this.label1.Text = "過濾字符范例";
			// 
			// label2
			// 
			this.label2.Font = new System.Drawing.Font("宋體", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
			this.label2.Location = new System.Drawing.Point(32, 64);
			this.label2.Name = "label2";
			this.label2.Size = new System.Drawing.Size(72, 23);
			this.label2.TabIndex = 1;
			this.label2.Text = "產品編號：";
			// 
			// txtId
			// 
			this.txtId.Location = new System.Drawing.Point(128, 64);
			this.txtId.Name = "txtId";
			this.txtId.TabIndex = 2;
			this.txtId.Text = "";
			this.txtId.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.txtId_KeyPress);
			this.txtId.TextChanged += new System.EventHandler(this.txtId_TextChanged);
			// 
			// Form1
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(264, 118);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.txtId,
																		  this.label2,
																		  this.label1});
			this.Name = "Form1";
			this.Text = "Form1";
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 應用程序的主入口點。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new Form1());
		}

		private void txtId_TextChanged(object sender, System.EventArgs e)
		{
			int Loc = txtId.SelectionStart;
			txtId.Text = txtId.Text.ToUpper();
			txtId.SelectionStart = Loc;		

		}

		private void txtId_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
		{
			if (txtId.Text.Length < 6)
			{
				if (txtId.SelectionStart == 0)
				{
					string S = e.KeyChar.ToString().ToUpper();
					if (S.CompareTo("A")<0 || S.CompareTo("Z")>0)
						e.Handled = true;
				}
				else
				{
					if (e.KeyChar.CompareTo('0')<0 || e.KeyChar.CompareTo('9')>0)
					{
						if(e.KeyChar != '\b')
							e.Handled = true;
					}
				}
			}
			else
			{
				if (e.KeyChar != '\b')
					e.Handled = true;
			}

		}
	}
}