Question

For updating record in Entity framework I am trying that. I am just assigning primary key CompanyID and The name of Company CompanyName to company because I need to change company name only. Record is not updating.

using (var myentity= new MyEntities())
{
    myentity.AttachTo("Companies", company);
    myentity.SaveChanges();
}

Answer 1

I think you need to first attach it and only after that set the company name.

Something like this:

var company = new Company;
company.CompanyID = yourID;

using (var myentity= new MyEntities())
{
    myentity.AttachTo("Companies", company);
    company.CompanyName = newName;
    myentity.SaveChanges();
}