Student Management System and student information management system

Student Management System and student information management system
1. logon form

Basic controls:

Label)

Main attributes: Image (the Image displayed on the tag)

Text (Text displayed on tags)

TextBox (text box Control)

Main attribute: PasswordChar (indicating the characters displayed in the text box when the password is used, rather than the text actually entered)

Button)

ComboBox (drop-down box) attribute: SelectedItem: gets the currently selected item

Event: Click (when the control is clicked)

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 ("Login successful"); this. hide (); FormMain frm = new FormMain (); frm. show () ;}} catch (Exception) {MessageBox. show ("exit");} finally {con. close ();}

Sender is the event source, indicating the object where the event occurred. when the event occurs, the event source is the button.

E is an event parameter (EventArgs) object. Different events have different parameters.

The Close () method is a Form-like Form method used to Close the Form.

2. Myschool Administrator

01. Add an event handler to the "add student" menu item in the menu bar. The Code is as follows:

Private void added student ToolStripMenuItem_Click (object sender, EventArgs e) {FormStudent formStudent = new FormStudent (); formStudent. Show ();}

02. Add Student Information

Public void Save () {// Add student string pwd = txtpwd. text; string stuname = textname. text; // gender string stugender = string. empty; if (radioman. checked) {stugender = "1";} else {stugender = "0";} // bind the data int gid = GeadIdName () in the drop-down box; // contact number string StuPhone = textphone. text; // address string StuAddress = textAddress. text; // Date DateTime dt = dateBirthday. value; // email 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 ("added successfully");} con. close ();}

3. query Student Information

// Query the student information 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"]); // name string stuname = Convert. toString (dr ["studentName"]); // gender string stuGender = Convert. toString (dr ["Gender"]); // rank string stuGname = Convert. toString (dr ["Gradename"]); ListViewItem LvItem = new ListViewItem (stuNo. toString (); LvItem. subItems. add (stuname); LvItem. subItems. add (stuGender); LvItem. subItems. add (stuGname); // associate lvItem and ListView with lvlist. items. add (LvItem);} dr. close () ;}} catch (Exception) {throw ;}finally {con. close ();}

// Called in the form Load event

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);        }

Modify Student Information

Public void upatae () {// Add student string pwd = txtpwd. text; string stuname = textname. text; // gender string stugender = string. empty; if (radioman. checked) {stugender = "1";} else {stugender = "0";} // bind the data int gid = GeadIdName () in the drop-down box; // contact number string StuPhone = textphone. text; // address string StuAddress = textAddress. text; // Date DateTime dt = dateBirthday. value; // email 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 ("modified successfully");} con. close ();}

// Gender if determination: male is 1 to female 0.