title: Bootstrap alert in button event on asp.net
body: <p>How could I make a code that when I click a button on asp.net, an alert message of bootstrap or message box appears? </p>
  
  <pre><code>protected void ButtonLogin_Click(object sender, EventArgs e)
      {
          //TextBoxEmail.Text = DateTime.Now.ToString();
          string UserName = TextBoxEmail.Text.Trim();
          string password = TextBoxPassword.Text.Trim();
          OracleConnection conn = new OracleConnection(strConnString);
          conn.Open();
  
          sql = "select password from userlogin where USERNAME = '" + UserName + "' and password ='" + password + "' ";
      cmd = new OracleCommand(sql, conn);
  
  
      // orada=new OracleDataAdapter(com.CommandText,conn);
      // cmd.CommandType = CommandType.Text;
      dr = cmd.ExecuteReader();
      //dr.Read();
  
      if (dr.HasRows)
      {
          Label1.Text = "";
          Response.Redirect("Details.aspx");
      }
      else
      {
          Label1.Text = "No data found...";
          conn.Close();
      }
  
     }
  
  }
  </code></pre>
  
  <p>Above, in the else portion:</p>
  
  <pre><code> else
           {
               Label1.Text = "No data found...";
               conn.Close();
           }
  </code></pre>
  
  <p>When username and password don't match, I want a bootstrap alert or message box to appear on the website: "password is not correct". How could I do that?</p>