C# and ASP - Retaining Variable Value on Button Click

Question

I am working on a warning system for another person's website. The premise is simple enough, if the conditions are met and the warningFlag variable is set "", the warning is made and the warningFlag variable is set to "Y".

However it never retains the value and always triggers the warning. I have tried the ViewState and it would not work. Bit confused as to why it would not work as the ViewState should have done the trick. Maybe I am missing something? Can you help out an ASP beginner?

Page_Load

if (ViewState["warningFlag"] == null)
    ViewState.Add("warningFlag", ""); //Add the flag
else
    ViewState["warningFlag"] = ""; //Reset the flag

Button click event

if (ViewState["warningFlag"].ToString() == "")
{
    if (this.checkForWarning()) //Checks if Warning conditions are met
    {
        ViewState["warningFlag"] = "Y";

        //Warning Message Code goes here
        return;
    }
}

Royi Namir · Accepted Answer · 2015-11-13 11:17:02Z

1

Line 2,4 are doing the same thing(not 100% , but with the same final result)

if (ViewState["warningFlag"] == null)
    ViewState.Add("warningFlag", ""); //Add the flag
else
    ViewState["warningFlag"] = ""; //Reset the flag

If you want to stop getting the Warning do this :

if (ViewState["warningFlag"] == null)
    ViewState.Add("warningFlag", "");  
else
    ViewState["warningFlag"] = "x"; //<-------- see this

Edit ( after comment)

So change to this :

if (ViewState["warningFlag"] == null)
    ViewState.Add("warningFlag", ""); //Add the flag
else

if (ViewState["warningFlag"].ToString() !="Y")
     ViewState["warningFlag"] = ""; //Reset the flag

edited Nov 13, 2015 at 11:17

answered Nov 13, 2015 at 11:12

Royi Namir

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1 Comment

Jeremy Beare Over a year ago

But what if you want the warning to only no longer appear if the button was clicked?

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