Insertion on Asp.Net Mvc Failed - asp.net-mvc

Question

On my asp.net mvc project, the table data will be displayed on a grid view using Index Method.
After doing Insertion, it would redirect to Index using RedirectToAction. But for the First time, the new row is getting added to the grid. When tried second time, the insertion is not possible.
But if i reload the page using browser reload again, for the first time only insertion takes place. Please help me to resolve this issue.
When I tried to debug, "the process has been changed since the last step" takes place. So, the values during the first debug also coming for insertion on second time which break the operation. Give Solution pls..
public ActionResult Index()
{
X_DEVEntities Entity = new X_DEVEntities();
var outPut=Entity.Model.ToList();
return View(outPut);
}
public ActionResult Insert(Model modelData)
{
X_DEVEntities Entity = new X_DEVEntities();
modelData.create_user_id = "ty";
modelData.last_mod_dtm = DateTime.Now;
modelData.last_mod_user_id = "gdf";
Entity.Model.Add(modelData);
Entity.SaveChanges();
return RedirectToAction("Index");
}

Answer 1

On second insertion you are getting error because on each insertion you'll have same create_user_id and last_mod_user_id based upon the your Insert method you posted.
I'm guessing it should be something like this
public ActionResult Insert(Model modelData)
{
X_DEVEntities Entity = new X_DEVEntities();//try not to do this in your Insert method, rather have a constructer where you place this instantiation.
Entity.yourTableName.UserId=modelData.create_user_id;//(UserId should be the field where you want to place the username you get from the view)
modelData.last_mod_dtm = DateTime.Now;
Entity.yourTableName.LastModUserId=modelData.last_mod_user_id;//again LastModUserId is the field where you want to save your modelData.last_mod_user_id in table.
Entity.Model.Add(modelData);
Entity.SaveChanges();
return RedirectToAction("Index");
}