BarCode for ASP.NET Web Forms
EncodingException Property
Example 

C1.Web.Wijmo.Controls.4 Assembly > C1.Web.Wijmo.Controls.C1BarCode Namespace > C1BarCode Class : EncodingException Property
Gets the System.Exception that prevented the Text from being encoded.
Syntax
'Declaration
 
Public ReadOnly Property EncodingException As System.Exception
public System.Exception EncodingException {get;}
Remarks

Most encodings have limitations that determine what type of text it can represent. For example, some are numeric-only and some require text of a specific length.

If the value of the Text property cannot be represented using the current CodeType, then no bar code will be generated and the control will remain blank.

In this case, the EncodingException property returns details about the exception that prevented the bar code from being generated.

Example
The code below sets the Text property and shows a message in case any errors were detected:
this.C1BarCode1.Text = this.TextBox1.Text;
Exception exc = this.C1BarCode1.EncodingException;
this.Label1.Text = exc == null ? "" : exc.Message;
See Also

Reference

C1BarCode Class
C1BarCode Members