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POEntering keys manually with Entity Framework
 

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    <p>I'm trying to use Entity Framework code first for a simple database project and I run into a problem I simply cannot figure out. </p> <p>I noticed EF was setting the ID for my tables automatically increasing by 1 each time, completely ignoring the value I entered manually for that field. After some searching it is my understanding that the right way to disable this behavior is doing:</p> <pre><code>modelBuilder.Entity&lt;Event&gt;().Property(e =&gt; e.EventID).HasDatabaseGeneratedOption(DatabaseGeneratedOption.None); </code></pre> <p>However now I'm just getting this error and I have no idea why:</p> <blockquote> <p>Unhandled Exception: System.Data.Entity.Infrastructure.DbUpdateException: An error occurred while updating the entries. See the inner exception for details. ---</p> <blockquote> <p>System.Data.UpdateException: An error occurred while updating the entries. See the inner exception for details. ---> System.Data.SqlClient.SqlException: Cannot insert explicit value for identity column in table 'Events' when IDENTITY_INSERT is set to OFF.</p> </blockquote> </blockquote> <p>If it's helpful, here is the POCO class in question:</p> <pre><code>public class Event { [Key, Required] public int EventID { get; set; } public string EventType { get; set; } //TODO: Event Type Table later on public DateTime StartDate { get; set; } public DateTime EndDate { get; set; } public virtual ICollection&lt;Match&gt; Matches { get; set; } public virtual ICollection&lt;EventParticipation&gt; EventParticipation { get; set; } } </code></pre> <p>Thanks in advance.</p>
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    1. CONote: you can also use an attribute directly on the property itself, if you find that it makes maintaining your models easier. `[DatabaseGeneratedAttribute(DatabaseGeneratedOption.None)]`
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