Eval Method (String, String)
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TemplateControl.Eval Method (String, String)


Evaluates a data-binding expression using the specified format string to display the result.

Namespace:   System.Web.UI
Assembly:  System.Web (in System.Web.dll)

protected internal string Eval(
	string expression,
	string format


Type: System.String

The navigation path from the container to the public property value to place in the bound control property.

Type: System.String

A .NET Framework format string to apply to the result.

Return Value

Type: System.String

A string that results from the evaluation of the data-binding expression and conversion to a string type.

Exception Condition

The data-binding method can only be used for controls contained on a Page.


expression is null.

- or -

expression is an empty string ("").

The value of expression must evaluate to a public property.

The Eval method calls the Eval method using the GetDataItem method to resolve the object reference that the expression is evaluated against.

.NET Framework
Available since 2.0
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