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

我在上面的代码中我从组合框中选择一个项目并使用datatable创建一个表并在datagrid中显示它。然后我点击删除按钮。该项目将从数据库中删除，但在此我想要在运行时从组合框中删除该项目。我已经在上面的代码中使用了两个查询用于选择，一个用于删除如果我用户加载方法它不起作用，因为连接已经打开错误来了。

Answer 1

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

您可以使用功能RemoveItem

YourCombo.RemoveItem(index)

或清除YourCombo.Clear()的组合并重新加载

如何在从数据库中删除后从运行时删除组合框中的项目

1 个答案: