You should use the following code to make the ASPxGridView show data from this table:
if (connection.State == ConnectionState.Closed) {
connection.Open();
SqlCommand cmd = new SqlCommand("Select * From YazHata order by HataAdi ASC", connection);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
ASPxGridView1.DataSource = dt; // <<<<
ASPxGridView1.DataBind(); //<<<<<
da.Dispose();
connection.Close();
}
solved c# Devexpress datagridview to gridcontrol. manualy