Entity framework: Db context scope and transaction - asp.net-mvc

Question

I have an MVC 5 web app which talks to my class library for db needs and the class library uses Entity Framework 6 for that.
Below are 2 methods from the class library.
Both of them are initiating a new context. How do I make 'em use only one context instead, without using class level variable?
Also, if these 2 methods were to save stuff, context.SaveChanges(), how can I wrap them both into one transaction, even if the save happens in different classes?
public int FindUnknownByName(string name, string language)
{
using (var context = new ScriptEntities())
{
int languageId = this.FindLanguage(language);
var script = context.scripts.Where(l => l.Name == name && l.Unknown == true && l.LanguageId == languageId).FirstOrDefault();
if (script != null)
{
return script.Id;
}
return 0;
}
}
public int FindLanguage(string language)
{
using (var context = new ScriptEntities())
{
var lang = context.languages.Where(l => l.Name == language).FirstOrDefault();
if (lang != null)
{
return lang.Id;
}
return 0;
}
}

Answer 1

Make the context a private class variable.
private ScriptEntities context = new ScriptEntities()
public int FindUnknownByName(string name, string language)
{
int languageId = this.FindLanguage(language);
var script = context.scripts.Where(l => l.Name == name && l.Unknown == true && l.LanguageId == languageId).FirstOrDefault();
if (script != null)
{
return script.Id;
}
return 0;
}
public int FindLanguage(string language)
{
var lang = context.languages.Where(l => l.Name == language).FirstOrDefault();
if (lang != null)
{
return lang.Id;
}
return 0;
}
Also implement IDisposable and dispose context.

Answer 2

You can use extension methods:
public int FindUnknownByName(this ScriptEntities context, string name, string language)
{
int languageId = context.FindLanguage(language);
var script = context.scripts.Where(l => l.Name == name && l.Unknown == true && l.LanguageId == languageId).FirstOrDefault();
if (script != null)
{
return script.Id;
}
return 0;.
}
public int FindLanguage(this ScriptEntities context, string language)
{
var lang = context.languages.Where(l => l.Name == language).FirstOrDefault();
if (lang != null)
{
return lang.Id;
}
return 0;
}
then:
using (var context = new ScriptEntities())
{
var language = context.FindUnknownByName('name', 'language')
}