c# - Check if User/Email exists in AD -


i have form in page user informs email or user name other user. in submit event, need check information exists in active directory. how make check?? i'm clear?

my page

<asp:label id="lbluseradd" runat="server" font-bold="true" text="add user - (email or user name)"></asp:label>     <br />     <asp:textbox id="txtuseradd" runat="server" height="17px" width="150px"></asp:textbox>     <asp:label id="lblerror" runat="server" class="control-label" for="inputerror" visible="false">input error</asp:label>     <asp:label id="lblsuccess" runat="server" class="control-label" for="inputsuccess"         visible="false">input success</asp:label>     <asp:button id="btnadduser" class="btn" runat="server" font-bold="true" text="add user"         onclick="btnsenduser_onclick" />     <br />     <table id="tblusers" class="table table-bordered">         <asp:label id="lbluser" runat="server" visible="false"></asp:label>     </table>

my .cs

protected void btnsenduser_onclick(object sender, eventargs e) {     principalcontext addomain = new principalcontext(contexttype.domain, "x.com", "amsndruser", "x");      lbluser.visible = true;     lbluser.text = txtuseradd.text;     if (txtuseradd.text != "email ad" || txtuseradd.text != "user name ad" || txtuseradd.text != "user ad")     {         lblerror.visible = true;     }      else     {         lblsuccess.visible = true;     } }

i create solution this.

protected void btnsenduser_onclick(object sender, eventargs e) {     string loginfo = txtuseradd.text;     string logininfo = txtuseradd.text;     principalcontext insprincipalcontext = new principalcontext(contexttype.domain, "x.com", "amsndruser", "xxx");     userprincipal insuserprincipal = userprincipal.findbyidentity(insprincipalcontext, logininfo);     if (insuserprincipal == null)     {         lblerror.visible = true;     }      else     {         lblsuccess.visible = true;         lbluser.visible = true;         lbluser.text = txtuseradd.text;     } }

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