如何删除数据库后从运行组件中删除项目

Question

Private Sub btn_remove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_remove.Click 
     Dim Query As String 
     Dim query1 As String 
     Dim i As Integer = 0 
     i = DataGridView1.CurrentRow.Index 
     Dim strValueYouWant As String = String.Empty 
     strValueYouWant = DataGridView1.Item(0, i).Value 
     Dim result1 As DialogResult = MessageBox.Show("Are you sure,you want delete the selected row?", _ 
     "Important Question", MessageBoxButtons.YesNo) 
     If result1 = DialogResult.Yes Then 

      mysqlconn.Open() 
      Query = "delete from table1 where show_id= '" & strValueYouWant & "'" 
      Dim cmd As MySqlCommand = New MySqlCommand(Query, mysqlconn) 
      Dim k As Integer = cmd.ExecuteNonQuery() 
      Query = Nothing 

      cmd.Dispose() 

      query1 = "select * from table1" 
      Dim cmd1 As New MySqlCommand(query1, mysqlconn) 
      Dim reader As MySqlDataReader = cmd1.ExecuteReader 
      Dim table As New DataTable() 
      table.Load(reader) 
      DataGridView1.DataSource = table 

      query1 = Nothing 

     ElseIf result1 = DialogResult.No Then 
      Exit Sub 
     End If 
     mysqlconn.Close() 
    End Sub 

我上面的代码我从组合框中选择一个项目，并使用datatable创建一个表并将其显示在datagrid中。然后我点击删除按钮。该项目正在从数据库中删除，但在这里我想在运行时从组合框中删除该项目。我已经在上面的代码之一中使用了两个查询来选择一个用于删除的用户，如果我的用户加载方法不起作用，因为连接已经打开错误了。

Answer 1

请参阅本网站 http://msdn.microsoft.com/en-us/library/19fc31ss.aspx

您可以使用功能RemoveItem

YourCombo.RemoveItem(index)

或YourCombo.Clear()清除组合并再次装入