c# - Dropdown value coming blank but still going in IF condition -

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while submitting form, not selecting value dropdownlist , checking condition as

if (request.form["cmbnextuser"] != session["userid"].tostring() || request.form["cmbnextuser"] != null || request.form["cmbnextuser"] != "")         {             transfermail();         }

so, while debugging value comes below.

img

the value coming blank still going in if condition

  1. condition 1 causing since comparing value 

     request.form["cmbnextuser"] != session["userid"].tostring()

    i.e "" != session["userid"].tostring() evaluated ture thats why it executing if block.

  2. change code this

    if (!string.isnullorempty(request.form["cmbnextuser"]) || request.form["cmbnextuser"] != session["userid"].tostring() ) {     transfermail(); }

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