Örnek hata :
Server Error in '/' Application.
Cannot insert the value NULL into column 'id', table '******_db.*****_us.yonetim'; column does not allow nulls. INSERT fails.
The statement has been terminated.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Cannot insert the value NULL into column 'id', table '******1_db.*****1_us.yonetim'; column does not allow nulls. INSERT fails.
The statement has been terminated.
Source Error:
Line 54: cmd.Parameters.Add("ad", TextBox3.Text);
Line 55: cmd.Parameters.Add("soyad", TextBox4.Text);
Line 56: cmd.ExecuteNonQuery();
Line 57: Response.Write("Kullanıcı Başarıyla Eklendi");
Line 58: Response.Redirect("kullanicilar.aspx");
Source File: w:\inetpub\vhosts\******.com\httpdocs\panel\kullanicilar.aspx.cs Line: 56
Stack Trace:
[SqlException (0x80131904): Cannot insert the value NULL into column 'id', table '*****1_db.******1_us.yonetim'; column does not allow nulls. INSERT fails.
The statement has been terminated.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +1787814
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5341674
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +546
System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +1693
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +275
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds) +1421
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +177
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(TaskCompletionSource`1 completion, String methodName, Boolean sendToPipe, Int32 timeout, Boolean asyncWrite) +208
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +163
yonetim_kullanicilar.Button2_Click(Object sender, EventArgs e) in w:\inetpub\vhosts\********.com\httpdocs\panel\kullanicilar.aspx.cs:56
System.Web.UI.WebControls.Button.OnClick(EventArgs e) +9628442
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +103
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +35
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1724 
