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copied!<p>The error is exactly what it says. You cannot use <code>con</code> in your initialization of <code>da</code> because it will only be created during an instance creation. You will need to create <code>con</code> as <code>static</code> or put your initialization lines in your constructor.</p> <p><strong>HOWEVER</strong>, you should probably not do this in practice as you are just asking for somebody to open a <code>SqlConnection</code> and leave it open. You should probably fall more into the practice of creating your connections using a <code>using</code> block to take advantage of the disposing pattern</p> <p>Static:</p> <pre><code>public partial class Form1 : Form { static SqlConnection con = new SqlConnection(@"Data Source=TALY-PC;Initial Catalog=Katalogi;Integrated Security=True;Pooling=False"); SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM tblArtikujt", con); DataSet dsl = new DataSet(); public Form1() { InitializeComponent(); } </code></pre> <p>Or instantiation in the constructor:</p> <pre><code>public partial class Form1 : Form { SqlConnection con; SqlDataAdapter da; DataSet dsl; public Form1() { InitializeComponent(); con = new SqlConnection(@"Data Source=TALY-PC;Initial Catalog=Katalogi;Integrated Security=True;Pooling=False"); da = new SqlDataAdapter("SELECT * FROM tblArtikujt", con); dsl = new DataSet(); } } </code></pre> <p>I will let you <a href="http://msdn.microsoft.com/en-us/library/yh598w02%28v=vs.80%29.aspx" rel="nofollow">research the using block yourself</a></p>

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