form_lj.cs

一个很简单的考试系统。实用性很强啊！数据库在里面

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

namespace bizdb
{
	/// <summary>
	/// Form_lj 的摘要说明。
	/// </summary>
	public class Form_lj : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lbl_fwq;
		private System.Windows.Forms.Label lbl_sjk;
		private System.Windows.Forms.Label lbl_yhm;
		private System.Windows.Forms.Label lbl_mm;
		private System.Windows.Forms.TextBox txt_fwq;
		private System.Windows.Forms.TextBox txt_sjk;
		private System.Windows.Forms.TextBox txt_yhm;
		private System.Windows.Forms.TextBox txt_mm;
		private System.Windows.Forms.Button btn_qd;
		private System.Windows.Forms.Button btn_lk;
		private dbAccess db = new dbAccess();
		private common c = new common();

		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public Form_lj()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
			
		}

		/// <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 Windows Form Designer generated code
		/// <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.lbl_fwq = new System.Windows.Forms.Label();
			this.lbl_sjk = new System.Windows.Forms.Label();
			this.lbl_yhm = new System.Windows.Forms.Label();
			this.lbl_mm = new System.Windows.Forms.Label();
			this.txt_fwq = new System.Windows.Forms.TextBox();
			this.txt_sjk = new System.Windows.Forms.TextBox();
			this.txt_yhm = new System.Windows.Forms.TextBox();
			this.txt_mm = new System.Windows.Forms.TextBox();
			this.btn_qd = new System.Windows.Forms.Button();
			this.btn_lk = new System.Windows.Forms.Button();
			this.SuspendLayout();
			// 
			// lbl_fwq
			// 
			this.lbl_fwq.Location = new System.Drawing.Point(16, 24);
			this.lbl_fwq.Name = "lbl_fwq";
			this.lbl_fwq.TabIndex = 0;
			this.lbl_fwq.Text = "服务器";
			// 
			// lbl_sjk
			// 
			this.lbl_sjk.Location = new System.Drawing.Point(16, 72);
			this.lbl_sjk.Name = "lbl_sjk";
			this.lbl_sjk.TabIndex = 1;
			this.lbl_sjk.Text = "数据库";
			// 
			// lbl_yhm
			// 
			this.lbl_yhm.Location = new System.Drawing.Point(16, 120);
			this.lbl_yhm.Name = "lbl_yhm";
			this.lbl_yhm.TabIndex = 2;
			this.lbl_yhm.Text = "用户名";
			// 
			// lbl_mm
			// 
			this.lbl_mm.Location = new System.Drawing.Point(16, 168);
			this.lbl_mm.Name = "lbl_mm";
			this.lbl_mm.TabIndex = 3;
			this.lbl_mm.Text = "密码";
			// 
			// txt_fwq
			// 
			this.txt_fwq.Location = new System.Drawing.Point(128, 24);
			this.txt_fwq.Name = "txt_fwq";
			this.txt_fwq.TabIndex = 4;
			this.txt_fwq.Text = "";
			// 
			// txt_sjk
			// 
			this.txt_sjk.Location = new System.Drawing.Point(128, 72);
			this.txt_sjk.Name = "txt_sjk";
			this.txt_sjk.TabIndex = 5;
			this.txt_sjk.Text = "";
			// 
			// txt_yhm
			// 
			this.txt_yhm.Location = new System.Drawing.Point(128, 120);
			this.txt_yhm.Name = "txt_yhm";
			this.txt_yhm.TabIndex = 6;
			this.txt_yhm.Text = "";
			// 
			// txt_mm
			// 
			this.txt_mm.Location = new System.Drawing.Point(128, 168);
			this.txt_mm.Name = "txt_mm";
			this.txt_mm.PasswordChar = '*';
			this.txt_mm.TabIndex = 7;
			this.txt_mm.Text = "";
			// 
			// btn_qd
			// 
			this.btn_qd.Location = new System.Drawing.Point(32, 208);
			this.btn_qd.Name = "btn_qd";
			this.btn_qd.TabIndex = 8;
			this.btn_qd.Text = "确定";
			this.btn_qd.Click += new System.EventHandler(this.btn_qd_Click);
			// 
			// btn_lk
			// 
			this.btn_lk.Location = new System.Drawing.Point(136, 208);
			this.btn_lk.Name = "btn_lk";
			this.btn_lk.TabIndex = 9;
			this.btn_lk.Text = "离开";
			this.btn_lk.Click += new System.EventHandler(this.btn_lk_Click);
			// 
			// Form_lj
			// 
			this.AcceptButton = this.btn_qd;
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(248, 253);
			this.Controls.Add(this.btn_lk);
			this.Controls.Add(this.btn_qd);
			this.Controls.Add(this.txt_mm);
			this.Controls.Add(this.txt_yhm);
			this.Controls.Add(this.txt_sjk);
			this.Controls.Add(this.txt_fwq);
			this.Controls.Add(this.lbl_mm);
			this.Controls.Add(this.lbl_yhm);
			this.Controls.Add(this.lbl_sjk);
			this.Controls.Add(this.lbl_fwq);
			this.Name = "Form_lj";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "请选择数据库服务器";
			this.ResumeLayout(false);

		}
		#endregion

		protected override void OnLoad(System.EventArgs e)
		{
			this.Activate();
		}

		private void btn_qd_Click(object sender, System.EventArgs e)
		{
			if(File.Exists("conn.ini"))
			{
				File.Delete("conn.ini");
				StreamWriter srd;
				srd = File.CreateText("conn.ini");
				srd.WriteLine("server=" + txt_fwq.Text + ";database="+ txt_sjk.Text +
					";uid=" + txt_yhm.Text + ";pwd=" + txt_mm.Text);
				srd.Close();
			}
			else
			{
				StreamWriter srd;
				srd = File.CreateText("conn.ini");
				srd.WriteLine("server=" + txt_fwq.Text + ";database="+ txt_sjk.Text +
					";uid=" + txt_yhm.Text + ";pwd=" + txt_mm.Text);
				srd.Close();
			}
			
			db.connStr="server=" + txt_fwq.Text + ";database="+ txt_sjk.Text +
				";uid=" + txt_yhm.Text + ";pwd=" + txt_mm.Text;
			SqlConnection myConn = new SqlConnection();
			myConn.ConnectionString = db.connStr;
			try
			{
				myConn.Open();
			}
			catch
			{
				MessageBox.Show("数据库连接失败，请重新配置数据库连接",c.sysname+"课程体系试题库系统提示");
				return;
			}			
			string strCom = "SELECT name FROM sysobjects where xtype in ('u')";
			System.Data.SqlClient.SqlCommand comm;
			comm = myConn.CreateCommand();
			comm.CommandText = strCom;
			SqlDataAdapter mydataA= new SqlDataAdapter();
			mydataA.SelectCommand = comm;
			DataSet	myDataSet = new DataSet ( ) ;
			mydataA.Fill(myDataSet,"sysobjects");
			myConn.Close ( ) ;
			
			this.Hide();
			Form_logon fr2 =new Form_logon();
			fr2.Show();	
		}

		private void btn_lk_Click(object sender, System.EventArgs e)
		{
			Application.Exit();
		}
	}
}