what is the use of Eval in asp net

Question

What is the use of Eval   in ASP NET

User · Accepted Answer

Eval is used to bind to an UI item that is setup to be read-only (eg: a label or a read-only text box), i.e., Eval is used for one way binding - for reading from a database into a UI field.

It is generally used for late-bound data (not known from start) and usually bound to the smallest part of the data-bound control that contains a whole record. The Eval method takes the name of a data field and returns a string containing the value of that field from the current record in the data source. You can supply an optional second parameter to specify a format for the returned string. The string format parameter uses the syntax defined for the Format method of the String class.

User · Answer

While binding a databound control  you can evaluate a field of the row in your data source with eval   function   For example you can add a column to your gridview like that      lt asp BoundField DataField  YourFieldName    gt    And alternatively  this is the way with eval     lt asp TemplateField gt   lt ItemTemplate gt           lt asp Label ID  lbl  runat  server  Text   lt    Eval  YourFieldName     gt   gt           lt  asp Label gt   lt  ItemTemplate gt   lt  asp TemplateField gt    It seems a little bit complex  but it s flexible  because you can set any property of the control with the eval   function      lt asp TemplateField gt       lt ItemTemplate gt           lt asp HyperLink ID  HyperLink1  runat  server             NavigateUrl   lt     ShowDetails aspx id   Eval  Id     gt              Text   lt    Eval  Text     0      gt   gt  lt  asp HyperLink gt       lt  ItemTemplate gt   lt  asp TemplateField gt

User · Answer

IrishChieftain didn t really address the question  so here s my take   eval   is supposed to be used for data that is not known at run time  Whether that be user input  dangerous  or other sources

[asp.net] what is the use of Eval() in asp.net

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