System.Data.SqlClient.SqlException (0x80131904): Login failed for user
<p>This question may has been already put, but I do this for the first time and I don't know where I'm wrong.
I want to connect my asp.net web page to SQL Server 2012. My connection string is:  </p>

<pre><code>static private SqlConnection connection = new SqlConnection(@"Data Source=DESKTOP-U8B6J4S\SQLEXPRESS; Initial Catalog=DBSera; User ID=DESKTOP-U8B6J4S\PROGRAMARE; Password=");
</code></pre>

<p>When I connect SQL:</p>

<p><a href="https://i.stack.imgur.com/KIHzU.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KIHzU.jpg" alt="enter image description here"></a></p>

<p><a href="https://i.stack.imgur.com/ev5Zl.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ev5Zl.jpg" alt="enter image description here"></a></p>

<p>The error I'm getting is:</p>

<blockquote>
  <p>System.Data.SqlClient.SqlException (0x80131904): Login failed for user 'DESKTOP-U8B6J4S\PROGRAMARE'.</p>
</blockquote>

<p>So what I did wrong and should I do to establish the connection? Thanks in advance!</p>