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学生管理系统所需要的具体控件和主要属性：
1、登录窗体
基本控件：
label（标签控件）
主要属性：Image（在标签上显示的图像）
Text（在标签上显示的文本）
TextBox（文本框控件）
主要属性：PasswordChar(指示在作为密码框时，文本框中显示的字符，而不是实际输入的文本)
Button（按钮控件）
ComboBox（下拉框）属性：SelectedItem：获取当前选定的项
事件：Click（单击控件时发生）
private void butStyle_Click(object sender, EventArgs e)
{
string str = "Data source=.;Initial catalog=Myschool;uid=sa";
SqlConnection con = new SqlConnection(str);
string sql = "select count(1) from student where studentName='" + txtUserName.Text + "' and LoginPwd='" + txtPwd.Text + "'";
SqlCommand cmd = new SqlCommand(sql, con);
try
{
con.Open();
int count = Convert.ToInt32(cmd.ExecuteScalar());
if (count > 0)
{
MessageBox.Show("登陆成功");
this.Hide();
FormMain frm = new FormMain();
frm.Show();
}
}
catch (Exception)
{
MessageBox.Show("退出");
}
finally
{
con.Close();
}
</div>
Sender是事件源，表示发生了这个事件的对象，事件发生中，事件源就是按钮。
e是事件参数（EventArgs）对象，不同的事件会有不同的参数。
Close（）方法是窗体类Form的一个方法，作用是关闭窗体。
2.Myschool管理员
01.给菜单栏中的“新增学生”菜单项添加事件处理程序，代码如下
private void 新增学生ToolStripMenuItem_Click(object sender, EventArgs e)
{
FormStudent formStudent = new FormStudent();
formStudent.Show();
}
</div>
02.添加学生信息
public void Save()
{
//添加学生
string pwd = txtpwd.Text;
string stuname = textname.Text;
//性别
string stugender = string.Empty;
if (radioman.Checked)
{
stugender = "1";
}
else
{
stugender = "0";
}
//下拉框绑定数据
int gid = GeadIdName();
//联系电话
string StuPhone = textphone.Text;
//地址
string StuAddress = textAddress.Text;
//日期
DateTime dt = dateBirthday.Value;
//邮箱
string StuEmail = textEmail.Text;
//LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email
string sql = "insert into Student values('" + pwd + "','" + stuname + "','" + stugender + "'," + gid + ",'" + StuPhone + "','" + StuAddress + "','" + dt + "','" + StuEmail + "')";
string str = "Data source=.;Initial catalog=Myschool;uid=sa;";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
int count = cmd.ExecuteNonQuery();
if (count > 0)
{
MessageBox.Show("添加成功");
}
con.Close();
}
</div>
3.查询学生信息
//查询学生信息
public void LodaDataListView(string sql)
{
string str = "data source=.;initial catalog=Myschool;uid=sa;";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, con);
try
{
con.Open();
SqlDataReader dr = cmd.ExecuteReader();
if (dr != null)
{
if (dr.HasRows)
{
while (dr.Read())
{
int stuNo = Convert.ToInt32(dr["studentNo"]);
//姓名
string stuname = Convert.ToString(dr["studentName"]);
//性别
string stuGender = Convert.ToString(dr["Gender"]);
//年级名次
string stuGname = Convert.ToString(dr["Gradename"]);
ListViewItem LvItem = new ListViewItem(stuNo.ToString());
LvItem.SubItems.Add(stuname);
LvItem.SubItems.Add(stuGender);
LvItem.SubItems.Add(stuGname);
//让lvItem和ListView关联
lvlist.Items.Add(LvItem);
}
dr.Close();
}
}
}
catch (Exception)
{
throw;
}
finally
{
con.Close();
}
//窗体Load的事件中调用
private void Formselect_Load(object sender, EventArgs e)
{
string sql = "select StudentNO,StudentName,Gender,GradeName from Student,Grade where Student.GradeId=Grade.GradeId";
LodaDataListView(sql);
}
</div>
修改学生信息
public void upatae()
{
//添加学生
string pwd = txtpwd.Text;
string stuname = textname.Text;
//性别
string stugender = string.Empty;
if (radioman.Checked)
{
stugender = "1";
}
else
{
stugender = "0";
}
//下拉框绑定数据
int gid = GeadIdName();
//联系电话
string StuPhone = textphone.Text;
//地址
string StuAddress = textAddress.Text;
//日期
DateTime dt = dateBirthday.Value;
//邮箱
string StuEmail = textEmail.Text;
//LoginPwd, StudentName, Gender, GradeId, Phone, Address, Birthday, Email
string sql = @"update Student set StudentName='" + stuname + "',Gender=" + stugender + ",GradeId='" + gid + "',phone='" + StuPhone + "',Address='" + StuAddress + "',Birthday='" + dt + "',Email='" + StuEmail
+ "' where studentNo='" + textNo.Text + "'";
string str = "Data source=.;Initial catalog=Myschool;uid=sa;";
SqlConnection con = new SqlConnection(str);
SqlCommand cmd = new SqlCommand(sql, con);
con.Open();
int count = cmd.ExecuteNonQuery();
if (count > 0)
{
frmse