Exception while deleting a record

Question

1.00/5 (1 vote)

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I have few list of contact in my web page where I have "edit" and "delete" buttons besides each contact. The edit functionality is working perfectly but I am getting an exception while performing the delete operation. I get the following exception

"An error occurred while updating the entries. See the inner exception for details."

and the inner exception says as

"Cannot insert the value NULL into column 'ContactID', table 'TflStars.dbo.SchoolContact'; column does not allow nulls. UPDATE fails.\r\nThe statement has been terminated."

The above exception in the statement

C#

currentContext.SaveChanges();

I even checked the database in the column "ContactID". The column is assigned with primary key and the "ALlowNUll" is not been checked and cannot be checked since it is a primary key field. I cannot also delete the primary key because it is been refer ed by another another table through foreign key.

Can anyone please help me resolve this issue

AL EDIT: code from comment:
This is the code that performs the delete

C#

LinkButton btnDelete = (LinkButton)e.Item.FindControl("btnDelete");

if (btnDelete != null)
{
 if (this.ReadOnly)
 {
   btnDelete.Visible = false;
 }
 else
 {
  btnDelete.Visible = true;

  if (thisContact.UserDetails != null && thisContact.UserDetails.Count > 0)
  {
   btnDelete.CommandName = "CannotDelete";
   btnDelete.OnClientClick = "return window.alert('This contact cannot be deleted as there is a user login record using it')";
  }
  else
  {
   btnDelete.OnClientClick = "return window.confirm('Are you sure you want to delete this staff contact?')";
  }
  btnDelete.CommandArgument = thisContact.ContactID.ToString();

  if (thisContact.ContactID == SessionContents.CurrentUser.ContactID)
  {
   btnDelete.Visible = false;
  }
 }
}

Posted 30-Apr-15 3:50am

user 3008

Updated 30-Apr-15 5:12am

Andy Lanng

v2

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Comments

ZurdoDev 30-Apr-15 10:01am

The error means that your code is sending NULL for that column. You need to fix that.

virusstorm 30-Apr-15 10:14am

Can you post the code that is performing the delete. I suspect the issue might be a cascade problem.

user 3008 30-Apr-15 10:59am

LinkButton btnDelete = (LinkButton)e.Item.FindControl("btnDelete");

if (btnDelete != null)
{
if (this.ReadOnly)
{
btnDelete.Visible = false;
}
else
{
btnDelete.Visible = true;

if (thisContact.UserDetails != null && thisContact.UserDetails.Count > 0)
{
btnDelete.CommandName = "CannotDelete";
btnDelete.OnClientClick = "return window.alert('This contact cannot be deleted as there is a user login record using it')";
}
else
{
btnDelete.OnClientClick = "return window.confirm('Are you sure you want to delete this staff contact?')";
}
btnDelete.CommandArgument = thisContact.ContactID.ToString();

if (thisContact.ContactID == SessionContents.CurrentUser.ContactID)
{
btnDelete.Visible = false;
}
}
}

virusstorm 30-Apr-15 11:36am

I don't see the code where you are trying to delete the entity.

Joan Magnet 30-Apr-15 10:15am

Are you using a typed dataset?

Sergey Alexandrovich Kryukov 30-Apr-15 10:20am

The code sample has to be comprehensive.
—SA

Richard Deeming 30-Apr-15 10:22am

Is SchoolContact the table you're deleting from, or a table with a foreign-key relationship to the table you're deleting from? It sounds like an FK relationship which isn't set to cascade deletes.

Abdul Samad KP 30-Apr-15 11:15am

The code you have posted is not delete code, it is just changing the visibility of the button and setting the command argument etc, I assume this is the code you are using in item data bound event of a gird. Please post the code in the Item Command event

Andy Lanng 30-Apr-15 11:16am

please post the method that includes "currentContext.SaveChanges();"

If 'currentContext' is passed in or has outer scope then funny things can happen.
'SaveChanges' will save any changes made to any ef object still attached to the context.

Also check for db triggers?

PS: I updated the question with your comment

stnlylee 1-May-15 1:21am

I guess there might be some foreign key constraints between this table and other tables

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