Asp.net mvc 4 该名称在当前上下文中不存在

错误是当前上下文中不存在名称db。

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请帮我解决这个问题。

你忘了带大括号来使用积木。当前代码的结构如下所示：

if (ModelState.IsValid)
 {
 using (mydataEntities1 db = new mydataEntities1()) 
 db.Contactmodels.Add(model);
 db.SaveChanges();


 ModelState.Clear();
 model = null;
 ViewBag.Message = "Thanks for contacting us";

只需像任何其他代码块一样包装整个using块：

using (mydataEntities1 db = new mydataEntities1()) 
    db.Contactmodels.Add(model); // inside the block, "db" exists
db.SaveChanges(); //  outside the block, "db" is no longer in scope

using (mydataEntities1 db = new mydataEntities1())
{
    db.Contactmodels.Add(model);
    db.SaveChanges();
}