C# 为什么我的ASP.NET项目没有'；我什么也不做？

我正试图编写一个项目来显示

MMABooks

数据库中两个表中的一些数据。这些代码在C#中工作，但在ASP.Net中不工作。事实上，它没有任何作用，我也没有得到任何错误！为什么？有什么问题

string connectionString = "Data Source=localhost\\SqlExpress;" +
                "Initial Catalog=MMABooks;Integrated Security=True";

SqlConnection connection = new SqlConnection(connectionString);
string selectStatement = "SELECT Customers.Name, Customers.City, States.StateName " +
                "FROM Customers " +
                "INNER JOIN States " +
                "ON Customers.State = States.StateCode " +
                "WHERE Name LIKE @Name";

 SqlCommand SelectCommand = new SqlCommand(selectStatement, connection);
 SelectCommand.Parameters.AddWithValue("@Name", TextBox1.Text.Trim() + "%");

 connection.Open();
  var dataAdapter = new SqlDataAdapter(SelectCommand);
  DataTable dt = new DataTable();
  dataAdapter.Fill(dt);
  GridView1.DataSource = dt;

您需要ASP.NET中的，它将数据源绑定到最后一行之后的

GridView

GridView1.DataSource = dt;
GridView1.DataBind();

您需要ASP.NET中的，它将数据源绑定到最后一行之后的

GridView

GridView1.DataSource = dt;
GridView1.DataBind();

---

缺少

GridView1.DataSource=dt

After

GridView1.DataSource=dt

string connectionString = "Data Source=localhost\\SqlExpress;" +
                "Initial Catalog=MMABooks;Integrated Security=True";

SqlConnection connection = new SqlConnection(connectionString);
string selectStatement = "SELECT Customers.Name, Customers.City, States.StateName " +
                "FROM Customers " +
                "INNER JOIN States " +
                "ON Customers.State = States.StateCode " +
                "WHERE Name LIKE @Name";

 SqlCommand SelectCommand = new SqlCommand(selectStatement, connection);
 SelectCommand.Parameters.AddWithValue("@Name", TextBox1.Text.Trim() + "%");

 connection.Open();
  var dataAdapter = new SqlDataAdapter(SelectCommand);
  DataTable dt = new DataTable();
  dataAdapter.Fill(dt);
  GridView1.DataSource = dt;
  GridView1.DataBind();//you are missing this

缺少
GridView1.DataSource=dt
After
GridView1.DataSource=dt

string connectionString = "Data Source=localhost\\SqlExpress;" +
                "Initial Catalog=MMABooks;Integrated Security=True";

SqlConnection connection = new SqlConnection(connectionString);
string selectStatement = "SELECT Customers.Name, Customers.City, States.StateName " +
                "FROM Customers " +
                "INNER JOIN States " +
                "ON Customers.State = States.StateCode " +
                "WHERE Name LIKE @Name";

 SqlCommand SelectCommand = new SqlCommand(selectStatement, connection);
 SelectCommand.Parameters.AddWithValue("@Name", TextBox1.Text.Trim() + "%");

 connection.Open();
  var dataAdapter = new SqlDataAdapter(SelectCommand);
  DataTable dt = new DataTable();
  dataAdapter.Fill(dt);
  GridView1.DataSource = dt;
  GridView1.DataBind();//you are missing this