ERROR MESSAGE -------system.window.documents.listitem does not contain a constructor that takes 2 arguments

private void Wash_Iron_Load(object sender, EventArgs e)
{
obj = new WashManagement.WashIron(Constant.laundry_db);
LoadCategory(cmbitem1);
}
 
private void LoadCategory(ComboBox CboCategory)
{
IDataReader drCategory;
drCategory = obj.GetCategoryName();
while (drCategory.Read())
{
CboCategory.Items.Add(new ListItem(drCategory["product_category_name"].ToString(), drCategory["product_category_no"].ToString())); //---------> ERROR MESSAGE
 
 
}
 
public IDataReader GetCategoryName()
{
try
{
DbCommand com = db.GetStoredProcCommand(USP_Get_Category);
return db.ExecuteReader(com);
}
catch (Exception)
{
throw;
}
}
 
//GET PRODUCT CATEGORY
private const string USP_Get_Category = "USP_Get_Category";