How do I get the int value of a string in a combobox, in other to insert the int value into another table in the database using a stored procedure

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C#

{"Cross-thread operation not valid: Control 'cmbLateTxt' accessed from a thread other than the thread it was created on."}

What I have tried:

public enum ClientLate

<pre lang="c#">

{
Select = 1,
Insert_Select = 2
}
public void lateTimeMethod(ClientLate C_late, ComboBox cmbLateTxt)
{
using (SqlConnection con = new SqlConnection(_con))
{
SqlCommand cmd = con.CreateCommand();
cmd.CommandType = CommandType.StoredProcedure;
cmd.CommandText = "Select_All_Lateness";
con.Open();

if (C_late == ClientLate.Select)
{
cmd.Parameters.AddWithValue("@status", C_late);
SqlDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
cmbLateTxt.Items.Add(reader[0]);
}
}
else if (C_late == ClientLate.Insert_Select)
{
if (cmbLateTxt != null)
{
int id = int.Parse(cmbLateTxt.SelectedItem.ToString());
cmd.Parameters.AddWithValue("@status", C_late);
cmd.Parameters.AddWithValue("@reason",id);
SetPromptLateness("Reason Submitted Successfully");
int i = cmd.ExecuteNonQuery();
}