做学生系统管理收获

GridView删除功能：

首先设置GridView控件的

添加一个ButtonField控件然后将其

CommandName 属性设置为del,然后打开GridView控件的属性，绑定其GridView1_RowCommand事件

然后在GridView1_RowCommand()事件中写如下代码：

int index = Convert.ToInt32(e.CommandArgument);//得到当前行号
        string Leid = GridView2.Rows[index].Cells[0].Text; //得到班级的ID号text;
        if (e.CommandName == "del")
        {
            using (SqlConnection sqlCnn = new SqlConnection(Student.cnnstring))
            {
                using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
                {
                    sqlCmm.CommandText = "delete from lessonlist where lessonid='" + Leid + "'";
                    sqlCnn.Open();
                    int i = sqlCmm.ExecuteNonQuery();
                    if (i > 0)
                    {
                        scan1();
                        ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('删除成功'）</script>", false);
                    }
                    else
                    {
                        ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('删除失败'）</script>", false);
                    }
                }
            }
        }

 

DropDownlist绑定数据到GridView：

using (SqlConnection sqlCnn = new SqlConnection(Student.cnnstring))
        {
            using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
            {

                sqlCmm.CommandText = "select Timename from Time";
                sqlCnn.Open();
                SqlDataReader reader = sqlCmm.ExecuteReader();
                if (reader != null)
                {
                    while (reader.Read())
                    {
                        this.DropDownList1.Items.Add(reader["Timename"].ToString());
                    }
                }
                else
                {
                    ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('数据库中没有数据')</script>", false);

                   //弹出对话框显示：“数据库中没有数据'”
                }
            }
        }

浏览数据：从数据库到GridView：

 private void scan()
    {
        using (SqlConnection sqlCnn = new SqlConnection(Student.cnnstring))
        {
            using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
            {
                sqlCmm.CommandText = "select * from classlist";
                DataSet dt = new DataSet();
                SqlDataAdapter adapt = new SqlDataAdapter(sqlCmm.CommandText, sqlCnn);
                DataSet ds = new DataSet();
                adapt.Fill(ds);
                this.GridView1.DataSource = ds; 

                this.GridView1.DataBind();
            }
        }
    }

向数据库插入数据：检查两个数据数否与数据库内的数据相等，如果相等，则给出提示，如果数据库内没有相同的数据则将其插入数据库：

protected void btn_addLe_Click(object sender, EventArgs e)
    {
        if (this.txb_Lename.Text.Length>=10)
        {
            ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('课程名称长度应小于十位')</script>", false);
        }
        bool bol = false;
        using (SqlConnection sqlCon=new SqlConnection(Student.cnnstring))
        {
            using (SqlCommand sqlCom=sqlCon.CreateCommand())
            {
                sqlCom.CommandText = "select lessonid,lessonname from lessonlist";
                sqlCon.Open();
                SqlDataReader reader = sqlCom.ExecuteReader();
                if (reader!=null)
                {
                    while (reader.Read())
                    {
                        if (reader["lessonid"].ToString()==this.txb_Leid.Text)
                        {
                            ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alter('课程编号已存在！')</script>", false);
                            bol = true;
                        }
                        if (reader["lessonname"].ToString()==this.txb_Lename.Text)
                        {
                            ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alter('课程名称已存在！')</script>", false);
                            bol = true;
                        }
                    }
                    if (bol)
                    {
                       
                    }
                    else
                    {
                        add_lesson();
                    }
                }
                else
                {
                    ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alter('数据库没有数据！')</script>", false);
                }
               
            }
        }
        add_lesson();
    }

 

private void add_lesson()
    {
        using (SqlConnection sqlCnn = new SqlConnection(Student.cnnstring))
        {
            using (SqlCommand sqlCmm = sqlCnn.CreateCommand())
            {
                sqlCmm.CommandText = "insert into lessonlist values(@lessonid,@lessonname)";
                SqlParameter lessonid = sqlCmm.Parameters.Add("@lessonid", SqlDbType.Int);
                lessonid.Value = this.txb_Leid.Text;
                SqlParameter lessonname = sqlCmm.Parameters.Add("@lessonname", SqlDbType.NChar, 10);
                lessonname.Value = this.txb_Lename.Text;
                sqlCnn.Open();
                int i = sqlCmm.ExecuteNonQuery();
                if (i > 0)
                {
                    scan1();
                    ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('添加成功')</script>", false);
                }
                else
                {
                    ClientScript.RegisterStartupScript(GetType(), "提示", "<script>alert('添加失败'）</script>", false);
                }
            }
        }
    }

页面间使用参数传值：

本页面：

Response.Redirect("Classedit.aspx?param1='"+claid+"'&param2='"+claname+"'");
Response.Redirect("Classedit.aspx");

目标页面：

this.txb_edit_num.Text = Request["param1"].Replace("'", "");
 this.teb_edit_name.Text = Request["param2"].Replace("'", "");

用户登录后才可以访问，否则跳转到登录界面Login.aspx：

在Web.config文件中这样写：

<authentication mode="Forms">
            <forms defaultUrl="Login.aspx" loginUrl="Login.aspx" timeout="2880" protection="All"/>
        </authentication>
    <authorization>
      <deny users="?"/>
      <allow users="*"/>
    </authorization>//defaultUrl="Login.aspx"为跳转到的页面