ComboBox for ASP.NET Web Forms
DataTextFormatString Property
Example 

C1.Web.Wijmo.Controls.4 Assembly > C1.Web.Wijmo.Controls.C1ComboBox Namespace > C1ComboBox Class : DataTextFormatString Property
The formatting applied to the text field. For example,"{0:d}".
Syntax
'Declaration
 
Public Property DataTextFormatString As System.String
public System.string DataTextFormatString {get; set;}
Example
C1ComboBox c = new C1ComboBox();
c.DataSource = data;
c.DataTextField = "textField";
c.DataValueField = "valueField";
c.DataBind();
See Also

Reference

C1ComboBox Class
C1ComboBox Members