gridview - Setting a footer without GridViewCommandEventArgs in asp.net -

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I have a gridview. The footer is labeled. I need to set the label within a function..I do not have any E (GridViewCommandEventArgs) due to no such occurrence of it now. This is my code 

  `GridViewRow footer = (GridViewRow) CartGrid.FooterRow; Label total = (label) footer Fund Control ("Total Elblatt"). Text = sum.ToString (); `  
 I'm getting the error - & gt; 'Object is not set to an instance of reference object.'  
  CartGrid  is the gridview. The label for  LBL total  is the label  Yoga .   
 
 
 You can use or for event example,  
  Zero to CartGrid_RowCreated (Object Sender, GridViewRowEventArgs E) {if (r.Row.RowType == DataControlRowType.Footer) {...}}

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