Server Error in '/' Application.

Input string was not in a correct format.

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.FormatException: Input string was not in a correct format.

Source Error:


Line 25:             lettura(Session("idscuola"))
Line 26: 				
Line 27: 				Dim idscuola As Integer = CInt(lbl_idscuola.Text)
Line 28:            
Line 29: 			lbl_segnalibro.Text = "<A NAME='" & CStr(idscuola) & "'> "

Source File: D:\inetpub\webs\acoiit\site\03_formazione\130_scuole_dettaglio.aspx.vb    Line: 27

Stack Trace:


[FormatException: Input string was not in a correct format.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat) +224
   Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +92

[InvalidCastException: Conversion from string "" to type 'Integer' is not valid.]
   Microsoft.VisualBasic.CompilerServices.Conversions.ToInteger(String Value) +248
   _default.Page_Load(Object sender, EventArgs e) in D:\inetpub\webs\acoiit\site\03_formazione\130_scuole_dettaglio.aspx.vb:27
   System.Web.UI.Control.OnLoad(EventArgs e) +97
   System.Web.UI.Control.LoadRecursive() +61
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +693


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4690.0