c# - How to require text in a Textbox? -


how go requiring text in textbox? have far.

string strname = txtname.text; string stremail = txtemail.text; boolean blnerrors = false;  if (strname == null) {  } else {     string script = "alert(\"name field required!\");";     scriptmanager.registerstartupscript(this, gettype(), "servercontrolscript", script, true);      txtname.focus(); }

when run program , try execute it, error popping regardless if have text entered textbox or not. want error show if there nothing in textbox. have tried using,

if (strname == "")

as well. nothing changes.

change code : 

string strname = txtname.text.trim(); //add trim here string stremail = txtemail.text; boolean blnerrors = false;  if (string.isnullorwhitespace(sstrname)) //this function checks both null or empty string. {     string script = "alert(\"name field required!\");";     scriptmanager.registerstartupscript(this, gettype(), "servercontrolscript", script, true);     txtname.focus();     return;//return function there error. }  //continue usual .

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