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我为备份和恢复机制设计了一个应用程序。当我按下备份按钮时，它将成功地在所选路径上创建备份文件。但是，当我要恢复同一个数据库，然后那个时候它显示我的错误RESTORE无法处理数据库
RESTORE不能处理数据库“email_client”，因为它是在使用 告别本次会议。建议主数据库执行此operation.RESTORE数据库时终止 正常使用
所以请提供编码它
private SqlCommand cmd;
string sql = "";
public Backup()
{
InitializeComponent();
}
private void button2_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=email_client;Integrated Security=True");
con.Open();
try
{
SqlCommand cmd = new SqlCommand("backup database email_client to disk ='" + textBox1.Text + "\\" + textBox2.Text + ".bak'", con);
cmd.ExecuteNonQuery();
MessageBox.Show("done");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
private void button1_Click(object sender, EventArgs e)
{
FolderBrowserDialog dlg = new FolderBrowserDialog();
if (dlg.ShowDialog() == DialogResult.OK)
{
textBox1.Text = dlg.SelectedPath;
}
}
private void button4_Click(object sender, EventArgs e)
{
OpenFileDialog dlg = new OpenFileDialog();
dlg.Filter = "Backup files(*.bak)|*.bak|All Files(*.*)|*.*";
dlg.FilterIndex = 0;
if (dlg.ShowDialog() == DialogResult.OK)
{
textBox3.Text = dlg.FileName;
}
}
private void button3_Click(object sender, EventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=email_client;Integrated Security=True");
con.Open();
try
{
sql = "alter database email_client set single_user with rollback immediate ;";
sql += "RESTORE database email_client from disk='"+textBox3.Text+"'with replace;";
cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
con.Close();
con.Dispose();
MessageBox.Show("done");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
}