addgrade.aspx.cs

一个学生管理系统的C++源程序

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;

namespace sms
{
	/// <summary>
	/// addgrade 的摘要说明。
	/// </summary>
	public class addgrade : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox Tbx_studentid;
		protected System.Web.UI.WebControls.Button Btn_add;
		protected System.Web.UI.WebControls.Label Lbl_note;
		protected System.Web.UI.WebControls.Button Btn_exit;
		protected System.Web.UI.WebControls.TextBox Tbx_term;
		protected System.Web.UI.WebControls.CustomValidator Cv_id;
		protected System.Web.UI.WebControls.DropDownList Ddl_course;
		protected System.Web.UI.WebControls.TextBox Tbx_grade;
	    SqlConnection cn;
		private void Page_Load(object sender, System.EventArgs e)
		{
			string strconn= ConfigurationSettings.AppSettings["dsn"];
			// 在此处放置用户代码以初始化页面
			cn=new SqlConnection(strconn);	
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <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.Tbx_studentid.TextChanged += new System.EventHandler(this.Tbx_studentid_TextChanged);
			this.Cv_id.ServerValidate += new System.Web.UI.WebControls.ServerValidateEventHandler(this.Cv_id_ServerValidate);
			this.Btn_add.Click += new System.EventHandler(this.Btn_add_Click);
			this.Btn_exit.Click += new System.EventHandler(this.Btn_exit_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void Btn_add_Click(object sender, System.EventArgs e)
		{
			string strsql="update student_course set Student_grade=@Student_grade where Student_id=@Student_id and  Course_id=@Course_id and Course_year=@Course_year";
			 SqlCommand cm=new SqlCommand(strsql,cn);
			 cm.Parameters.Add(new SqlParameter("@Student_id",SqlDbType.VarChar,50));
			 cm.Parameters["@Student_id"].Value=Tbx_studentid.Text;
			 cm.Parameters.Add(new SqlParameter("@Course_id",SqlDbType.VarChar,50));
			 cm.Parameters["@Course_id"].Value=Ddl_course.SelectedItem.Value;
			 cm.Parameters.Add(new SqlParameter("@Course_year",SqlDbType.Char,10));
			 cm.Parameters["@Course_year"].Value=Tbx_term.Text;
			cm.Parameters.Add(new SqlParameter("@Student_grade",SqlDbType.Int,4));
			cm.Parameters["@Student_grade"].Value=Tbx_grade.Text;
			 cm.Connection.Open();
			try
			{
				cm.ExecuteNonQuery();
			    Response.Redirect("grade_manage.aspx");
				
			}
			catch(SqlException)
			{
				Lbl_note.Text="添加失败";
				Lbl_note.Style["color"]="red";
			}
			 cm.Connection.Close();			
		 	
		}
		

		private void Btn_exit_Click(object sender, System.EventArgs e)
		{
			Response.Redirect("grade_manage.aspx");
		}

		private void Cv_id_ServerValidate(object source, System.Web.UI.WebControls.ServerValidateEventArgs args)
		{
			string strconn= ConfigurationSettings.AppSettings["dsn"];
			cn=new SqlConnection(strconn);
			cn.Open();
			string strsql="select * from student where Student_id='"+Tbx_studentid.Text+"'";
			SqlCommand cm=new SqlCommand(strsql,cn);
			SqlDataReader dr=cm.ExecuteReader();
			if(dr.Read())
			{
				args.IsValid=true;
			}
			else
			{
				args.IsValid=false;
			}
			cn.Close();
		
		}



		private void Tbx_studentid_TextChanged(object sender, System.EventArgs e)
		{		//课程名称下拉列表框绑定
			string strconn= ConfigurationSettings.AppSettings["dsn"];
			SqlConnection cn0=new SqlConnection(strconn);
				cn0.Open ();
				string mysql1="select course.* from student_course,course where student_course.Student_id='"+Tbx_studentid.Text+"'and student_course.Course_id=course.Course_id";
				SqlCommand cm1=new SqlCommand  (mysql1,cn0);
				SqlDataReader dr1=cm1.ExecuteReader ();
				while(dr1.Read ())
				{
					Ddl_course.Items .Add (new ListItem(dr1["Course_name"].ToString() ,dr1["Course_id"].ToString()) );
				}
				cn0.Close ();
			
		}

		
	}
}