急！怎么读出某个数据并绑定到TextBox上？

<%@ Page %>
<%@ Import Namespace="System.Data.SqlClient" %>
<%@ Import Namespace="System.Data" %>
<html>
  <body>
    <form method=post runat="server">
      <asp:DataGrid runat="server" ID="Datagrid1"
        DataKeyField="EmployeeID"
        OnEditCommand="Datagrid1_Edit"
        OnUpdateCommand="Datagrid1_Update"
        OnCancelCommand="Datagrid1_Cancel"
        OnDeleteCommand="Datagrid1_Delete"
        AutoGenerateColumns="False"
        Width="100%"
        HeaderStyle-Font-Size="10"
        HeaderStyle-Font-Bold="true"
        HeaderStyle-ForeColor="Red"
        HeaderStyle-BackColor="Yellow"
        HeaderStyle-BorderColor="Red"
        HeaderStyle-BorderWidth="5"
        FooterStyle-BorderColor="Red"
        FooterStyle-BorderWidth="5"
        ItemStyle-BackColor="LightCyan"
        ItemStyle-ForeColor="DarkBlue"
        AlternatingItemStyle-BackColor="LightYellow"
        AlternatingItemStyle-ForeColor="Maroon">
        <Columns>
          <asp:EditCommandColumn ItemStyle-Width="25px"
            EditText="<img border=0 alt='Edit record' src=Edit.gif>"
            CancelText="<img border=0 alt='Cancel changes' src=Cancel.gif>"
            UpdateText="<img border=0 alt='Accept changes'  src=OK.gif>"
          />
<asp:ButtonColumn ItemStyle-Width="25px" ButtonType="LinkButton"
  Text="<img border=0 src=Delete.gif>" CommandName="delete"
/>
          <asp:BoundColumn HeaderText="ID" ItemStyle-Width="30px" DataField="EmployeeID" ReadOnly="true" />
          <asp:TemplateColumn HeaderText="Title" ItemStyle-Width="50px">
            <ItemTemplate>
              <%# DataBinder.Eval(Container.DataItem, "TitleOfCourtesy") %>
            </ItemTemplate>
            <EditItemTemplate>
              <asp:DropDownList runat="server" ID="EditTitle" DataSource='<%# TitlesOfCourtesy %>'
                SelectedIndex='<%# GetSelectedTitle(DataBinder.Eval(Container.DataItem, "TitleOfCourtesy")) %>' />
            </EditItemTemplate>
          </asp:TemplateColumn>
          <asp:TemplateColumn HeaderText="Name">
            <ItemTemplate>
              <b><%# DataBinder.Eval(Container.DataItem, "LastName") %></b>,
              <%# DataBinder.Eval(Container.DataItem, "FirstName") %>
            </ItemTemplate>
            <EditItemTemplate>
              <asp:TextBox runat="server" ID="EditLastName" Text='<%# DataBinder.Eval(Container.DataItem, "LastName") %>' />
              <asp:TextBox runat="server" ID="EditFirstName" Text='<%# DataBinder.Eval(Container.DataItem, "FirstName") %>' />
            </EditItemTemplate>
          </asp:TemplateColumn>
          <asp:BoundColumn HeaderText="City" ItemStyle-Width="150px" DataField="City" />
          <asp:TemplateColumn HeaderText="USA?" ItemStyle-Width="35px" ItemStyle-HorizontalAlign="Center">
            <ItemTemplate>
              <asp:CheckBox runat="server" Enabled="false"
                Checked='<%# DataBinder.Eval(Container.DataItem, "Country").ToString() == "USA" %>' />
            </ItemTemplate>
          </asp:TemplateColumn>
        </Columns>
      </asp:DataGrid>
    </form>
  </body>
</html><script runat="server" language="C#">
  public string[] TitlesOfCourtesy
  {
    get {
      return new string[4]{"Mr.", "Dr.", "Ms.", "Mrs."};
    }
  }

  int GetSelectedTitle(object title)
  {
    return Array.IndexOf(TitlesOfCourtesy, title.ToString());
  }

  void Page_Load()
  {
    if (!Page.IsPostBack)
      BindGrid();
  }

  void BindGrid()
  {
    // create the command and the connection
    string connString = "server=(local);database=Northwind;uid=sa;pwd=;";
    string sql = @"SELECT * FROM Employees";
    SqlConnection conn = new SqlConnection(connString);
    SqlCommand cmd = new SqlCommand(sql, conn);

    // open the connection and get the Reader
    conn.Open();
    SqlDataReader reader = cmd.ExecuteReader();

    // bind the reader to the DataList
    Datagrid1.DataSource = reader;
    Datagrid1.DataBind();

    // close the reader and the connection
    reader.Close();
    conn.Close();
  }

  void Datagrid1_Edit(Object sender, DataGridCommandEventArgs e)
  {
    Datagrid1.EditItemIndex = (int)e.Item.ItemIndex;
    BindGrid();
  }

  void Datagrid1_Cancel(Object sender, DataGridCommandEventArgs e)
  {
    Datagrid1.EditItemIndex = -1;
    BindGrid();
  }  void Datagrid1_Update(Object sender, DataGridCommandEventArgs e)
  {
    // get the ID of the record to update
    int empID = (int)Datagrid1.DataKeys[e.Item.ItemIndex];

    // get the references to the edit controls
    DropDownList title = (DropDownList)e.Item.FindControl("EditTitle");
    TextBox lastName = (TextBox)e.Item.FindControl("EditLastName");
    TextBox firstName = (TextBox)e.Item.FindControl("EditFirstName");
    TextBox city = (TextBox)e.Item.Cells[5].Controls[0];

    // create the connection and the UPDATE command
    string connString = "server=(local);database=Northwind;uid=sa;pwd=;";
    string sql = @"UPDATE Employees SET TitleOfCourtesy = @TitleOfCourtesy,
      LastName = @LastName, FirstName = @FirstName, City = @City WHERE EmployeeID = @EmployeeID";
    SqlConnection conn = new SqlConnection(connString);
    SqlCommand cmd = new SqlCommand(sql, conn);

// create the required parameters
    cmd.Parameters.Add(new SqlParameter("@TitleOfCourtesy", SqlDbType.NVarChar, 25));
cmd.Parameters["@TitleOfCourtesy"].Value = title.SelectedItem.Text.Trim();
    cmd.Parameters.Add(new SqlParameter("@LastName", SqlDbType.NVarChar, 20));
cmd.Parameters["@LastName"].Value = lastName.Text.Trim();
cmd.Parameters.Add(new SqlParameter("@FirstName", SqlDbType.NVarChar, 10));
cmd.Parameters["@FirstName"].Value = firstName.Text.Trim();
cmd.Parameters.Add(new SqlParameter("@City", SqlDbType.NVarChar, 15));
cmd.Parameters["@City"].Value = city.Text.Trim();
cmd.Parameters.Add(new SqlParameter("@EmployeeID", SqlDbType.Int, 4));
cmd.Parameters["@EmployeeID"].Value = empID;

    // execute the command
    cmd.Connection.Open();
    try {
      cmd.ExecuteNonQuery();
    }
    catch (SqlException) {
      // handle exception...
    }
    finally {
      cmd.Connection.Close();
    }

    // stop the editing and rebind the grid
    Datagrid1.EditItemIndex = -1;
    BindGrid();
  }

  void Datagrid1_Delete(Object sender, DataGridCommandEventArgs e)
  {
    // get the ID of the record to update
    int empID = (int)Datagrid1.DataKeys[e.Item.ItemIndex];

    // create the connection and the DELETE command
    string connString = "server=(local);database=Northwind;uid=sa;pwd=;";
    string sql = @"DELETE FROM Employees WHERE EmployeeID = " + empID.ToString();
    SqlConnection conn = new SqlConnection(connString);
    SqlCommand cmd = new SqlCommand(sql, conn);

    // execute the command
    cmd.Connection.Open();
    try {
      cmd.ExecuteNonQuery();
    }
    catch (SqlException) {
      // handle exception...
    }
    finally {
      cmd.Connection.Close();
    }

    // rebind the grid
    Datagrid1.EditItemIndex = -1;
    BindGrid();
  }
</script>
数据库是sql2000自带的.

TextBox1.Text=yourTable[0].Rows[0]["key"].ToString();

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注意看了，补充一下
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是这样的，比如说，表user：字段id,name,age
现在，我要SELECT id FROM user where name=China
然后把name为China(唯一)的age显示在TextBox.Text上，怎么显示？

<asp:textbox text=<%#Container.DataItem("id")%>>
这样不可以吗?

感谢大家，在camelials(祥子) 地提醒下，终于出来了。
正解为：
……
myDataSet = new DataSet();
TextBox.Text=myDataSet.Tables[0].Rows[0]["age"].ToString()

调试易

急！怎么读出某个数据并绑定到TextBox上？

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