怎样做sql server数据库的还原

以下为引用的内容：

void restoreButton_Click(object sender, System.EventArgs e)

{

string path = pathTextBox.Text;

string dbname = dbDropDownList.SelectedValue;

string restoreSQL（SQL Server培训 mySQL培训 ） = "use master;";

restoreSql += "restore database @dbname from disk = @path;";

string pai = "use master;ALTER DATABASE Wy SET OFFLINE WITH ROLLBACK IMMEDIATE;ALTER DATABASE Wy SET ONLINE WITH ROLLBACK IMMEDIATE";

SqlConnection conn = new SqlConnection(ConnStr);

SqlCommand com1 = new SqlCommand(pai, conn);

SqlCommand myCommand = new SqlCommand(restoreSql, new SqlConnection(ConnStr));

myCommand.Parameters.Add("@dbname", SqlDbType.Char);

myCommand.Parameters["@dbname"].Value = dbname;

myCommand.Parameters.Add("@path", SqlDbType.Char);

myCommand.Parameters["@path"].Value = path;

try

{

conn.Open();

com1.ExecuteNonQuery();

conn.Close();

myCommand.Connection.Open();

myCommand.ExecuteNonQuery();

infoLabel.Text = "恢复成功！
已经把备份"+path+"恢复到数据库（数据库培训 数据库认证 ）";

}

catch(Exception ex)

{

infoLabel.Text = "恢复失败！
出错信息如下：
" + ex.ToString();

}

finally

{

myCommand.Connection.Close();

}

}