Code tham khao về ASP.net

. Hàm hiển thị dữ liệu trên GridView (ví dụ grvUser) private void ListUsers() { String connStr; String strSQL; SqlConnection myConnection; SqlCommand myCommand; SqlDataAdapter myAdapter; DataTable myTable = new DataTable(); Mở kết nối connStr = Server = ; Initial Catalog = ; User Id = ; Password = ; myConnection = new SqlConnection(connStr); myConnection.Open(); Câu lệnh SQL strSQL = Select Id,Username,Fullname,Password,Sex,Email From User; Lấy Dữ liệu myCommand = new SqlCommand(strSQL, myConnection); myAdapter = new SqlDataAdapter(); myAdapter.SelectCommand = myCommand; myAdapter.Fill(myTable); myConnection.Close(); grvUser.DataSource = myTable; grvUser.DataBind(); }

MỘT SỐ ĐOẠN CODE THAM KHẢO Hàm hiển thị liệu GridView (ví dụ grvUser) private void ListUsers() { String connStr; String strSQL; SqlConnection myConnection; SqlCommand myCommand; SqlDataAdapter myAdapter; DataTable myTable = new DataTable(); //Mở kết nối connStr = "Server = ; Initial Catalog = ; User Id = ; Password = "; myConnection = new SqlConnection(connStr); myConnection.Open(); //Câu lệnh SQL strSQL = "Select Id,Username,Fullname,Password,Sex,Email From [User]"; //Lấy Dữ liệu myCommand = new SqlCommand(strSQL, myConnection); myAdapter = new SqlDataAdapter(); myAdapter.SelectCommand = myCommand; myAdapter.Fill(myTable); myConnection.Close(); } grvUser.DataSource = myTable; grvUser.DataBind(); Thực thi câu lệnh SQL String connStr; String strSQL; SqlConnection connection; SqlCommand cmd; connStr = "Server = ; Initial Catalog = ; User Id = ; Password = "; connection = new SqlConnection(connStr); connection.Open(); // Câu lệnh SQL: Insert/Update/Delete strSQL = " "; cmd = new SqlCommand(strSQL, connection); cmd.ExecuteNonQuery(); connection.Close(); Code trang UserAdmin.aspx using using using using System; System.Collections.Generic; System.Linq; System.Web; using using using using System.Web.UI; System.Web.UI.WebControls; System.Data.SqlClient; System.Data; namespace Student1.Admin { public partial class UserAdmin : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) ListUsers(); } private void ListUsers() { String connStr; String strSQL; SqlConnection myConnection; SqlDataAdapter myAdapter; DataTable myTable = new DataTable(); //Mở kết nối connStr = "Server = TRUONG-PC\\SQLEXPRESS; Initial Catalog = TESTDATA; User Id = truongxuan; Password = 123456"; myConnection = new SqlConnection(connStr); myConnection.Open(); //Câu lệnh SQL strSQL = "Select Id,Username,Fullname,Password,Sex,Email From [User]"; //Lấy Dữ liệu myAdapter = new SqlDataAdapter(strSQL, connStr); myAdapter.Fill(myTable); myConnection.Close(); grvUser.DataSource = myTable; grvUser.DataBind(); } public string str_bool(object obj) { bool b = bool.Parse(obj.ToString()); if (b) return "Nam"; else return "Nữ"; } protected void grvUser_RowEditing(object sender, GridViewEditEventArgs e) { grvUser.EditIndex = e.NewEditIndex; ListUsers(); } protected void grvUser_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e) { grvUser.EditIndex = -1; ListUsers(); } protected void grvUser_RowUpdating(object sender, GridViewUpdateEventArgs e) { //Lấy id dòng cần sửa int id = int.Parse(grvUser.DataKeys[e.RowIndex].Value.ToString()); //Cells[vitri]: Đây vị trí cột đánh số thứ tự – n //Controls[vitri]: Xét Cells xử lý control thứ đánh số từ – n, field có control nên đánh số string sUsername = ((TextBox)grvUser.Rows[e.RowIndex].Cells[1].Controls[0]).Text; string sFullname = ((TextBox)grvUser.Rows[e.RowIndex].Cells[2].Controls[0]).Text; string sSex = ((DropDownList)grvUser.Rows[e.RowIndex].FindControl("ddlSex")).SelectedValue; string sEmail = (grvUser.Rows[e.RowIndex].Cells[4].Controls[0] as TextBox).Text; //Thực thi lệnh Sửa String connStr; String strSQL; SqlConnection connection; SqlCommand cmd; connStr = "Server = TRUONG-PC\\SQLEXPRESS; Initial Catalog = TESTDATA; User Id = truongxuan; Password = 123456"; connection = new SqlConnection(connStr); connection.Open(); strSQL = "Update [User] Set Username = '" + sUsername + "', Fullname = N'" + sFullname + "', Sex = " + sSex + ", Email = '" + sEmail + "' Where Id = " + id.ToString(); cmd = new SqlCommand(strSQL, connection); cmd.ExecuteNonQuery(); connection.Close(); //gvSinhVien.EditIndex = -1: Thoát khỏi tình trạng Edit grvUser.EditIndex = -1; //Nạp lại liệu ListUsers(); } protected void grvUser_RowDeleting(object sender, GridViewDeleteEventArgs e) { //Lấy id dòng cần xóa int id = int.Parse(grvUser.DataKeys[e.RowIndex].Value.ToString()); //Thực thi lệnh Xóa String connStr; String strSQL; SqlConnection connection; SqlCommand cmd; connStr = "Server = TRUONG-PC\\SQLEXPRESS; Initial Catalog = TESTDATA; User Id = truongxuan; Password = 123456"; connection = new SqlConnection(connStr); connection.Open(); // Câu lệnh SQL: Insert/Update/Delete strSQL = "Delete From [User] Where Id = " + id.ToString(); cmd = new SqlCommand(strSQL, connection); cmd.ExecuteNonQuery(); connection.Close(); } //Nạp lại liệu ListUsers(); protected void grvUser_SelectedIndexChanging(object sender, GridViewSelectEventArgs e) { int id = int.Parse(grvUser.DataKeys[e.NewSelectedIndex].Value.ToString()); Response.Redirect("UserDetail.aspx?id=" + id.ToString()); } index protected void grvUser_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow && grvUser.EditIndex == -1) { //There are buttons and the second one is Delete button, that's why we use the //indexing goes as is button #1, Literal (Space between buttons), button #2, Literal (Space) etc ((LinkButton)e.Row.Cells[5].Controls[2]).OnClientClick = "return confirm('Do you really want to delete?');"; } } protected void btnAdd_Click(object sender, EventArgs e) { Response.Redirect("UserAdd.aspx"); } } } Code trang UserDetail.aspx using System; using System.Data.SqlClient; using System.Data; namespace Student.Admin { public partial class UserDetail : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { //Bắt id URL int id = int.Parse(Request.QueryString["id"].ToString()); //Câu lệnh JavaScript để đưa kiểm tra id vừa lấy, không cần thiết phải có dòng System.Web.HttpContext.Current.Response.Write("alert(\"Đã bắt Id = " + id.ToString() + "\")"); String connStr; String strSQL; SqlConnection myConnection; SqlDataAdapter myAdapter; DataTable myTable = new DataTable(); //Mở kết nối connStr = "Server = TRUONG-PC\\SQLEXPRESS; Initial Catalog = TESTDATA; User Id = truongxuan; Password = 123456"; myConnection = new SqlConnection(connStr); myConnection.Open(); //Câu lệnh SQL strSQL = "Select Username,Fullname,Sex,Email From [User] Where Id = " + id.ToString(); //Lấy Dữ liệu myAdapter = new SqlDataAdapter(strSQL, connStr); myAdapter.Fill(myTable); } } } lbUsername.Text = myTable.Rows[0][0].ToString(); lbFullname.Text = myTable.Rows[0][1].ToString(); lbSex.Text = bool.Parse(myTable.Rows[0][2].ToString()) == true ? "Nam" : "Nữ"; lbEmail.Text = myTable.Rows[0][3].ToString(); ... protected void btnAdd_Click(object sender, EventArgs e) { Response.Redirect("UserAdd.aspx"); } } } Code trang UserDetail.aspx using System; using System.Data.SqlClient; using System.Data; namespace