operator '&&' cannot be applied to operands of type 'string' and 'string'
<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>