The language used in expressions is determined by the value of the property C1PrintDocument.ScriptingOptions.Language. That property can have one of two possible values:

• VB. This is the default value, and indicates that the standard VB.NET will be used as the scripting language.
• C1Report. This value indicates that the C1Report scripting language will be used. While that language is similar to VB, there are subtle differences. This option is primarily provided for backwards compatibility.
• CSharp. This value indicates that the standard C# will be used as the scripting language.

If VB is used as the expression language, when the document is generated a separate assembly is built internally for each expression containing a single class derived from ScriptExpressionBase. This class contains the protected properties that can be used in the expression. The expression itself is implemented as a function of that class.

For example:

To write code in Visual Basic

Dim doc As New C1PrintDocument()
doc.ScriptingOptions.Language = ScriptLanguageEnum.CSharp
Dim rt As New RenderText("[PageNo == 1 ? ""First"" : ""Not first""]")
doc.Body.Children.Add(rt)

To write code in C#

C1PrintDocument doc = new C1PrintDocument();
doc.ScriptingOptions.Language = ScriptLanguageEnum.CSharp;
RenderText rt = new RenderText("[PageNo == 1 ? \"First\" : \"Not first\"]");
doc.Body.Children.Add(rt);