title: operator '&&' cannot be applied to operands of type 'string' and 'string'
body: <p>how to solve the error which contains operator '&amp;&amp;' cannot be applied to operands of type 'string' and 'string'. The code fallows as : </p>
  
  <pre><code>bool AttorneysData()
  {
      if (((txtFirstName.Text != "")
                  &amp;&amp; ((txtSurname.Text != "")
                  &amp;&amp; (txtAddress.Text
                  &amp;&amp; (txtTelNo.Text
                  &amp;&amp; (txtEmail.Text
                  &amp;&amp; (txtCreatePassword.Text
                  &amp;&amp; (txtConfirmPassword.Text
                  &amp;&amp; (cboDisciplineExpertise.Text
                  &amp;&amp; (cboGeographicalLocation.Text
                  &amp;&amp; (cboBudgetEstimation.Text
                  &amp;&amp; (txtNoofIndividuals.Text
                  &amp;&amp; (cboTypeofClients.Text
                  &amp;&amp; (txtCompanyName.Text &amp;&amp; txtYearsofExperience.Text))))))))))))))
      {
          return true;
      }
      else
      {
          return false;
      }
  
  }
  </code></pre>