Sql 如何将数据从数据库拉入组合框

我试图将数据从数据库拉到组合框，我有两个组合框，我想显示来自不同表的数据。 这是我正在尝试的代码

Try
        'declare variables

        Dim objDataAdapter As New SqlDataAdapter
        Dim objDataAdapter1 As New SqlDataAdapter
        Dim objDataSet As New DataSet()
        Dim objDataSet1 As New DataSet()

        '//state dataset of combo box
        ' Set the SelectCommand properties...
        objDataAdapter.SelectCommand = New SqlCommand()
        objDataAdapter.SelectCommand.Connection = sql.SqlConn
        objDataAdapter.SelectCommand.CommandText = "select * from tblBrand"
        objDataAdapter.SelectCommand.CommandType = CommandType.Text
        '//mention the second data 
        objdataadapter1.SelectCommand = New SqlCommand()
        objDataAdapter1.SelectCommand.Connection = sql.SqlConn
        objDataAdapter1.SelectCommand.CommandText = "select * from tblModel"
        objDataAdapter1.SelectCommand.CommandType = CommandType.Text

        ' Open the database connection...
        sql.SqlConn.Open()
        ' Fill the DataSet object with data...
        objDataAdapter.Fill(objDataSet, "tblBrand")
        objDataAdapter1.Fill(objDataSet1, "tblModel")
        ' Close the database connection...
        sql.SqlConn.Close()

        With (cboxBrandName)
            .DataSource = objDataSet
            .ValueMember = "tblBrand.BandID"
            .DisplayMember = "tblBrand.BrandName"
        End With
        With (cboxModel)
            .DataSource = objDataSet1
            .ValueMember = "tblModel.ModelID"
            .DisplayMember = "tblModel.ModelName"
        End With

    Catch ex As Exception
    End Try
End Sub

在这一行中没有显示任何错误，但我在组合框中找不到任何结果

我是这样做的-

    Dim ds As New DataSet()
    Dim conn As New SqlConnection(yourconnectionString)

    Const qry As String = "SELECT * FROM tblModel"

    conn.Open()
    Using da As New SqlDataAdapter(qry, conn)
        da.Fill(ds)
    End Using
    ' For Combobox

    With YourComboBoxName
        .DisplayMember = "what you want to display to the user in combobox"
        .ValueMember = "ID associated with each record"
        .DataSource = ds.Tables(0)
        .SelectedIndex = 0
    End With

    conn.Close()

---

希望这有帮助。

True这对我有帮助，你能给我一个提示，为什么在这里使用这行。selectedindex=0？因此，如果你想更改组合框中显示的“默认”值，你可以添加所选索引，它将显示与该索引关联的显示成员。在这种情况下，我的索引是1，brandid，brandname。。。。像这样，我的桌子开始转动。我的显示成员是brandname，brandid是值成员。所以为什么我们选择了selectedindex=0，我只是想知道代码。如果它在数据范围内，你可以让selectedindex成为你想要的任何数字，否则你会得到一个参数，我会尝试做不同的项目，这样我就会明白，真正的意义是什么。但现在我知道是什么了。谢谢菜鸟…没人帮我，如果我做错了，我很抱歉。我想你也看到了这个问题。