Update a single column to EF 6.0 using LINQ lambda ? MVC4 - linq

Question

I want to save the data when i edit something in my data-table on enter .
On enter control goes to method in controller where actual update performs .
My code till this point:
public string UpdateData(int id, string value, int? rowId, int? columnPosition, int? columnId, string columnName)
{
var Leadsinfo = ser_obj1.Lead_List();
if (columnPosition == 0 && Leadsinfo.Any(c => c.Contact_Name.ToLower().Equals(value.ToLower())))
return "Lead with a name '" + value + "' already exists";
var Lead = Leadsinfo.FirstOrDefault(c => c.Lead_Id == id);
if (Lead == null)
{
return "Lead with an id = " + id + " does not exists";
}
switch (columnPosition)
{
case 0:
Lead.Contact_Name = value;
iWise_NeoEntities ooo = new iWise_NeoEntities();
break;
case 1:
Lead.Contact_Address = value;
break;
case 2:
Lead.Lead_Source = value;
break;
case 3:
Lead.Domain = value;
break;
default:
break;
}
return value;
}
In the above code i mentioned i need to write logic where it should save to DB upon any column editing . using lambda linq is easy i guess , But i dont know even how to start ?
Do i need to write save under each case?

Answer 1

You can create update method in database:
public void UpdateLead(Lead model)
{
var entity = db.Set<Lead>().Find(model.Id);
db.Entry<Lead>(entity).CurrentValues.SetValues(model);
db.SaveChanges();
}
And use it where you need:
switch (columnPosition)
{
case 0: Lead.Contact_Name = value; break;
case 1: Lead.Contact_Address = value; break;
case 2: Lead.Lead_Source = value; break;
case 3: Lead.Domain = value; break;
default: break;
}
iWise_NeoEntities ooo = new iWise_NeoEntities();
ooo.UpdateLead(Lead);