标签：
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(); }
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。
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(); }
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(); }
//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); }
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) { frmselect.selectData(); MessageBox.Show("修改成功"); } con.Close(); }
//性别if判定:性别男为1 为女0.
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原文地址：http://www.cnblogs.com/s1294/p/5002225.html
