login.cs

数据库文件先要导入

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

namespace Login
{
	/// <summary>
	/// UserControl1 的摘要说明。
	/// </summary>
	/// 
	
	public class Login : System.Windows.Forms.UserControl
	{
		public string LoginName
		{
			get
			{
				return NameTextBox.Text;
			}
			set
			{
				NameTextBox.Text=value;
			}
	    }
		public string PassWord
		{
			get
			{
				return PassTextBox.Text;
			}
			set
			{
			    PassTextBox.Text=value;
			}
		}
		private System.Windows.Forms.Label NameLabel;
		private System.Windows.Forms.Label PassLabel;
		private System.Windows.Forms.TextBox NameTextBox;
		private System.Windows.Forms.TextBox PassTextBox;
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Login()
		{
			// 该调用是 Windows.Forms 窗体设计器所必需的。
			InitializeComponent();

			// TODO: 在 InitComponent 调用后添加任何初始化

		}

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

		#region 组件设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器 
		/// 修改此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.NameLabel = new System.Windows.Forms.Label();
			this.PassLabel = new System.Windows.Forms.Label();
			this.NameTextBox = new System.Windows.Forms.TextBox();
			this.PassTextBox = new System.Windows.Forms.TextBox();
			this.SuspendLayout();
			// 
			// NameLabel
			// 
			this.NameLabel.AutoSize = true;
			this.NameLabel.Location = new System.Drawing.Point(8, 16);
			this.NameLabel.Name = "NameLabel";
			this.NameLabel.Size = new System.Drawing.Size(54, 17);
			this.NameLabel.TabIndex = 0;
			this.NameLabel.Text = "登陆名：";
			// 
			// PassLabel
			// 
			this.PassLabel.AutoSize = true;
			this.PassLabel.Location = new System.Drawing.Point(8, 64);
			this.PassLabel.Name = "PassLabel";
			this.PassLabel.Size = new System.Drawing.Size(42, 17);
			this.PassLabel.TabIndex = 1;
			this.PassLabel.Text = "密码：";
			// 
			// NameTextBox
			// 
			this.NameTextBox.Location = new System.Drawing.Point(88, 16);
			this.NameTextBox.Name = "NameTextBox";
			this.NameTextBox.Size = new System.Drawing.Size(120, 21);
			this.NameTextBox.TabIndex = 2;
			this.NameTextBox.Text = "";
			this.NameTextBox.Validating += new System.ComponentModel.CancelEventHandler(this.NameTextBox_Validating);
			// 
			// PassTextBox
			// 
			this.PassTextBox.Location = new System.Drawing.Point(88, 64);
			this.PassTextBox.Name = "PassTextBox";
			this.PassTextBox.PasswordChar = '*';
			this.PassTextBox.Size = new System.Drawing.Size(120, 21);
			this.PassTextBox.TabIndex = 3;
			this.PassTextBox.Text = "";
			this.PassTextBox.Validating += new System.ComponentModel.CancelEventHandler(this.PassTextBox_Validating);
			// 
			// Login
			// 
			this.Controls.Add(this.PassTextBox);
			this.Controls.Add(this.NameTextBox);
			this.Controls.Add(this.PassLabel);
			this.Controls.Add(this.NameLabel);
			this.Name = "Login";
			this.Size = new System.Drawing.Size(216, 104);
			this.ResumeLayout(false);

		}
		#endregion

		
		private void NameTextBox_Validating(object sender, System.ComponentModel.CancelEventArgs e)
		{
			if(NameTextBox.Text=="")
			{
				MessageBox.Show("登陆名不能为空！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}

		private void PassTextBox_Validating(object sender, System.ComponentModel.CancelEventArgs e)
		{
			if(PassTextBox.Text=="")
			{
				MessageBox.Show("密码不能为空！","提示",MessageBoxButtons.OK,MessageBoxIcon.Information);
			}
		}
	}
}