Foreach loop not looping through checkbox list asp .net

I am trying to read a list of values that exist in a SQL database and if the value exists, it needs to check a checkbox in a checkbox list. At the moment, I can read the values of a specific employee but when I try to loop through the checkbox list, it skips it completely. I can add a new data entry by checking items perfectly but it’s only reading that is causing issues:

My sample code below is to test whether it even loops through the checkbox list.

var asd = GetEmployeeSpecificDisabilities(idNum, connString); //returns a list of a specific employees disabilities;

string value = string.Empty;

foreach (ListItem item in disabilityList.Items)
{
    value += item.Selected ? item.Text + "," : "";

The below code works perfectly when adding new employee details:

//create new list object
EmployeeList newEmployee = new EmployeeList();
    
newEmployee.EmployeeNumber = txtEmployeeNumber.Text;
newEmployee.IDNumber = txtIDnumber.Text;
newEmployee.employeeSurname = txtSurname.Text;
newEmployee.employeeName = txtName.Text;
newEmployee.numberOfDependants = Convert.ToInt32(txtNumOfDependants.Text);
newEmployee.Race = lsRaces.SelectedValue;
newEmployee.Gender = lsGender.SelectedValue;
                    
//if employee has a disability
if (disabilityList.Visible == true)
{
    foreach (ListItem x in disabilityList.Items)
    {
        if (x.Selected)
        {
            newEmployee.Disabilityreference_Id = Convert.ToInt32(x.Value);
            newEmployee.CreateNewEmployee(connString, newEmployee);
        }
    }
} 
else
{
    newEmployee.CreateNewEmployee(connString, newEmployee);
}
    
Response.Redirect("Default.aspx");

Front end code:

<asp:CheckBoxList ID="disabilityList" runat="server" style="left: 19px; top: 3px; width: 266px; border:medium; padding:inherit" DataSourceID="Disabilities" DataTextField="DisabilityReference" DataValueField="Id" Visible ="true" CssClass="checkbox checkbox"  Font-Size="Medium">
        </asp:CheckBoxList>
        <asp:SqlDataSource ID="Disabilities" runat="server" ConnectionString="<%$ ConnectionStrings:EmployeeDBConnectionString %>" SelectCommand="SELECT * FROM [Disabilities]"></asp:SqlDataSource>

Answers:

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Method 1

It seems you need to iterate GetEmployeeSpecificDisabilities and compare with disabilityList something like that:

var employeeDisabilities = GetEmployeeSpecificDisabilities(idNum, connString);
 
foreach(var employeeDisability in employeeDisabilities)
{
    foreach (ListItem item in disabilityList.Items)
    {
        if(item.Value == employeeDisability.Disabilityreference_Id.ToString())
        {
            item.Selected = true;
        }
    }
}

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