The Variable(Name) property specifies the value of giving variable. By default, the control supports variables such as Total and Count, which defines the Total of all valid lines, and count of them. The AllowVariables property specifies the expression ( no HTML ) that defines the equal operator, so you can define variables. The AddWildFormat method formats the line based on the giving wild characters expression. By default, the control has already the wild format defined as "<i>*=*</i>", which draws in italics any line that includes the = (equal) character ( define the variables ).  If the AllowVariables property is "", the control does not support defining any variable. The CalcType property specifies the type of operations the control supports.

The following samples show how you can define new variables using the "is" keyword, and highlight lines that includes it: