void Page_Load(object sender, System.EventArgs e)
{ if(!IsPostBack) {
// 创建数据库连接字符串和SQL语句
string ConnStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"];
string query = "SELECT * FROM Products";
// 执行数据库语句并填充数据到 DataTable 中
SqlCommand myCommand = new SqlCommand(query, new SqlConnection(ConnStr));
SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand);
DataTable dt = new DataTable(); myAdapter.Fill(dt);
// 数据绑定 DropDownList 控件
DropDownList1.DataSource = dt;
DropDownList1.DataTextField = "ProductName"; DropDownList1.DataValueField = "ProductName";
DropDownList1.DataBind(); } }
void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e)
{ Label1.Text = "UnitPrice: " + DropDownList1.SelectedValue; } void Page_Load(object sender, System.EventArgs e) { if(!IsPostBack) { // 创建数据库连接字符串和SQL语句 string ConnStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"]; string query = "SELECT * FROM Products"; // 执行数据库语句并填充数据到 DataTable 中 SqlCommand myCommand = new SqlCommand(query, new SqlConnection(ConnStr)); SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand); DataTable dt = new DataTable(); myAdapter.Fill(dt); // 数据绑定 DropDownList 控件 DropDownList1.DataSource = dt; DropDownList1.DataTextField = "ProductName"; DropDownList1.DataValueField = "ProductName"; DropDownList1.DataBind(); } } void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e) { Label1.Text = "UnitPrice: " + DropDownList1.SelectedValue; } void Page_Load(object sender, System.EventArgs e) { if(!IsPostBack) { // 创建数据库连接字符串和SQL语句 string ConnStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"]; string query = "SELECT * FROM Products"; // 执行数据库语句并填充数据到 DataTable 中 SqlCommand myCommand = new SqlCommand(query, new SqlConnection(ConnStr)); SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand); DataTable dt = new DataTable(); myAdapter.Fill(dt); // 数据绑定 DropDownList 控件 DropDownList1.DataSource = dt; DropDownList1.DataTextField = "ProductName"; DropDownList1.DataValueField = "ProductName"; DropDownList1.DataBind(); } } void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e) { Label1.Text = "UnitPrice: " + DropDownList1.SelectedValue; } void Page_Load(object sender, System.EventArgs e) { if(!IsPostBack) { // 创建数据库连接字符串和SQL语句 string ConnStr = System.Configuration.ConfigurationSettings.AppSettings["ConnectionSqlServer"]; string query = "SELECT * FROM Products"; // 执行数据库语句并填充数据到 DataTable 中 SqlCommand myCommand = new SqlCommand(query, new SqlConnection(ConnStr)); SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand); DataTable dt = new DataTable(); myAdapter.Fill(dt); // 数据绑定 DropDownList 控件 DropDownList1.DataSource = dt; DropDownList1.DataTextField = "ProductName"; DropDownList1.DataValueField = "ProductName"; DropDownList1.DataBind(); } } void DropDownList1_SelectedIndexChanged(object sender, System.EventArgs e) { Label1.Text = "UnitPrice: " + DropDownList1.SelectedValue; }
