asp.net 因为数据库正在使用的解决方法

protected void Button1_Click(object sender, EventArgs e)
{
string path = "e:\\MAZ数据库备份\\" + Menu+ ".bak";
if (File.Exists(path))
{
File.Delete(path);//注意，这个步骤很重要，如果重复，在备份的数据，就会变成，
//你刚开始的数据,所以每次都要先删除．
　　　　　　}
if (!File.Exists(path))
{
FileStream fs = File.Create(path);
fs.Close();
}
string backupstr="backup database Test to disk='"+path+"';";
SqlConnection con = new SqlConnection("server=localhost;database=Menu;uid=sa;pwd=sa;");
SqlCommand cmd = new SqlCommand(backupstr, con);
try
{
con.Open();
cmd.ExecuteNonQuery();
MessageBox.Show("备份成功！");
connection.Close();
}
catch (Exception ex)
{
string stringError = ex.ToString();
MessageBox.Show("备份失败！");
connection.Close();
}
}

protected void Button2_Click(object sender, EventArgs e)
{
string path = "e:\\MAZ数据库备份\\" + Menu+ ".bak";

string connectionStringTest = "server=localhost ;database=master;uid=sa;pwd=sa";
SqlConnection connection = new SqlConnection(connectionStringTest);
string backupstr = "restore database Menu from disk='" + path + "';";
try
{
string sql = "exec killspid '" + Menu+ "'";//这个很关键，要不然就出现题目上的错误了
SqlCommand cmd = new SqlCommand(sql, connection);
connection.Open();
cmd.ExecuteNonQuery();
cmd = new SqlCommand(backupstr, connection);
cmd.ExecuteNonQuery();
MessageBox.Show("恢复成功！");
connection.Close();
}
catch (Exception ex)
{
string stringError = ex.ToString();
MessageBox.Show("恢复失败！");
connection.Close();
}

}

create proc killspid (@dbname varchar(20))
as
begin
declare @sql nvarchar(500)
declare @spid int
set @sql='declare getspid cursor for
select spid from sysprocesses where dbid=db_id('''+@dbname+''')'
exec (@sql)
open getspid
fetch next from getspid into @spid
while @@fetch_status <>-1
begin
exec('kill') +@spid
fetch next from getspid into @spid
end
close getspid
deallocate getspid
end