Using Alert in Response Write Function in ASP NET

Question

I have database code like this   try       string strConnectionString   ConfigurationManager ConnectionStrings  SqlServerCstr   ConnectionString       SqlConnection myConnection   new SqlConnection strConnectionString       myConnection Open         string hesap   Label1 Text      string musteriadi   DropDownList1 SelectedItem Value      string avukat   DropDownList2 SelectedItem Value       SqlCommand cmd   new SqlCommand  INSERT INTO AVUKAT VALUES   MUSTERI   AVUKAT   HESAP    myConnection        cmd Parameters AddWithValue   HESAP   hesap       cmd Parameters AddWithValue   MUSTERI   musteriadi       cmd Parameters AddWithValue   AVUKAT   avukat       cmd Connection   myConnection       SqlDataReader dr   cmd ExecuteReader System Data CommandBehavior CloseConnection       Response Redirect Request Url ToString         myConnection Close      catch  Exception        Response Write   lt h2 gt ERROR lt  h2 gt         It works fine but what I want  in the catch function  is to call the javascript alert function   I ve tried this  Response Write   lt script language javascript gt alert  ERROR    lt  script gt      But there is an error   How can I show error message in javascript alert function

User · Answer

You can simply write    try          Your Logic and code     catch  Exception ex           Error message in  alert box     Response Write   lt script gt alert  Error     ex Message      lt  script gt          it will work fine

User · Answer

string str    Error mEssage   Response Write   lt script language javascript gt alert    str      lt  script gt

User · Answer

Try using RegisterScriptBlock   Example from the link   public void Page Load Object sender  EventArgs e           Define the name and type of the client scripts on the page      String csname1    PopupScript       String csname2    ButtonClickScript       Type cstype   this GetType            Get a ClientScriptManager reference from the Page class      ClientScriptManager cs   Page ClientScript          Check to see if the startup script is already registered      if   cs IsStartupScriptRegistered cstype  csname1               String cstext1    alert  Hello World            cs RegisterStartupScript cstype  csname1  cstext1  true                 Check to see if the client script is already registered      if   cs IsClientScriptBlockRegistered cstype  csname2               StringBuilder cstext2   new StringBuilder          cstext2 Append   lt script type   text javascript   gt  function DoClick              cstext2 Append  Form1 Message value  Text from client script     lt            cstext2 Append  script gt           cs RegisterClientScriptBlock cstype  csname2  cstext2 ToString    false

User · Answer

Use this      string popupScript     lt script language JavaScript gt    popupScript     alert  Please enter valid Email Id      popupScript      lt     popupScript     script gt    Page RegisterStartupScript  PopupScript   popupScript

User · Answer

Concatenate the string separating the slash and the word script in this way   Response Write   lt script language  javascript  gt alert  Especifique Usuario y Contrase  a    lt       script gt

User · Answer

Replace   Response Write   lt script language javascript gt alert  ERROR    lt  script gt      With  Response Write   lt script language javascript gt alert  ERROR    lt  script gt       In other words  you re missing a closing   at the end of the Response Write statement   It s worth mentioning that the code shown in the screenshot appears to correctly contain a closing double quote  however your best bet overall would be to use the ClientScriptManager RegisterScriptBlock method   var clientScript   Page ClientScript  clientScript RegisterClientScriptBlock this GetType     AlertScript    alert  ERROR      true     This will take care of wrapping the script with  lt script gt  tags and writing the script into the page for you

User · Answer

You ca also use  Response Write  alert  Error

[c#] Using Alert in Response.Write Function in ASP.NET

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