addgrade.aspx.cs

C# SQL遍写的学生选课系统 给大家看看 有点多 有点复杂

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 partial class addgrade : System.Web.UI.Page
	{
        private DataAccess DataAs;
		protected void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面	
		}

		#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.Cv_id.ServerValidate += new System.Web.UI.WebControls.ServerValidateEventHandler(this.Cv_id_ServerValidate);

		}
		#endregion

		protected void Btn_add_Click(object sender, System.EventArgs e)
		{
            string strsql = "update student_course set Student_grade=" + Tbx_grade.Text + " where Student_id='" + Tbx_studentid.Text + "'and  Course_id='" + Ddl_course.SelectedItem.Value + "' and Course_year='" + Tbx_term.Text+"'";
            DataAs = new DataAccess();
            bool Result = DataAs.ExecSql(strsql);
			if (Result)
			{
			    Response.Redirect("grade_manage.aspx");
				
			}
		    else
			{
				Lbl_note.Text="添加失败";
				Lbl_note.Style["color"]="red";
			}	
		 	
		}
		

		protected 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 strsql="select * from student where Student_id='"+Tbx_studentid.Text+"'";
            DataAs = new DataAccess();
            DataTable DT = DataAs.CreateDatatable(strsql);
			if(DT.Rows.Count>0)
			{
				args.IsValid=true;
			}
			else
			{
				args.IsValid=false;
			}
	
		
		}



		protected void Tbx_studentid_TextChanged(object sender, System.EventArgs e)
		{		
                //课程名称下拉列表框绑定
			
				string mysql1="select course.* from student_course,course where student_course.Student_id='"+Tbx_studentid.Text+"'and student_course.Course_id=course.Course_id";
                DataAs = new DataAccess();
                DataTable DT = DataAs.CreateDatatable(mysql1);
                for (int i = 0; i < DT.Rows.Count;i++ )
                {
                    Ddl_course.Items.Add(new ListItem(DT.Rows[i][1].ToString(), DT.Rows[i][0].ToString()));
                }
			
		}

		
	}
}