如何清除组合框

Private Sub ComboBox1_SelectedIndexChanged_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged 

    lblbrand.Text = ComboBox1.SelectedValue.ToString() 
    strb = lblbrand.Text 


    connetionString = "Data Source=HRS\SQLEXPRESS;AttachDbFilename='E:\My project\forms\1\1\mobile shop management.mdf';Integrated Security=True" 
    con = New SqlConnection(connetionString) 
    con.Open() 
    command = "select Model_id from mob where Brand ='" & lblbrand.Text & "'" 
    cmd = New SqlCommand(command, con) 
    Dim rd As SqlDataReader = cmd.ExecuteReader() 
    If rd.HasRows = True Then 
     While rd.Read() 
      ComboBox2.Items.Add(rd("Model_id")) 
     End While 
    End If 

End Sub

来源

2014-10-31 Harsh Vaidya

哪里是它试图清除“以前的值”，并是否意味着选择的代码？ – Plutonix 2014-10-31 16:54:19

始终为查询使用参数以避免sql注入。此外，您的HasRows检查是没有必要的。 – LarsTech 2014-10-31 18:00:10

简单的以前的值：

ComboBox2.Items.Clear()

来源

2014-10-31 17:30:40

如何清除组合框

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