无法获得独占访问权

Question

我试图在 vb.net 中恢复我的备份数据库，但我遇到了这个问题，这是什么问题？

This is the image of error

这是我正在使用的代码。

Private Sub btnRestore_Click(sender As Object, e As EventArgs) Handles btnRestore.Click
    Try
        Dim con2 As New SqlConnection
        Dim cmd2 As New SqlCommand
        Dim Filename2 As String
        Dim strQuery2 As String
        Dim database2 As String
        Dim get_servername2 As String
        'get value in selected database name dropdown menu in combo box
        database2 = cmbdatabase.Text
        get_servername2 = cmbservername.Text.Trim 'selecting servername
        Dim opendlg As New OpenFileDialog
        Dim constr2 As String
        constr2 = "Data Source=" & get_servername2 & ";Initial Catalog=master; Integrated Security= True "
        If opendlg.ShowDialog = Windows.Forms.DialogResult.OK Then
            Me.Cursor = Cursors.WaitCursor
            con2 = New SqlConnection(constr2)
            con2.Open()
            Filename2 = opendlg.FileName
            strQuery2 = " Restore database " & database2 & " from disk = '" & Filename2 & "'"

            'exe command
            Try
                cmd2 = New SqlCommand(strQuery2, con2)
                cmd2.ExecuteNonQuery()
                MessageBox.Show("Database " & database2 & " has been restored successfully. ", "Message", MessageBoxButtons.OK, MessageBoxIcon.Information)
                con2.Close()
                Me.Cursor = Cursors.Default
            Catch ex As Exception
                Me.Cursor = Cursors.Default
                MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Information)
            End Try
        End If
    Catch ex As Exception
        Me.Cursor = Cursors.Default
        MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Information)
    End Try
End Sub

Answer 1

您的连接字符串使用数据库Payroll 作为Intial Catalog。

如消息中所述，建议在执行此操作时使用master-database。

将Initial Catalog 更改为master，它应该可以工作：

constr2 = "Data Source=" & get_servername2 & ";Initial Catalog=master; Integrated Security=True"