Delete field (column) from a SharePoint list Using C#(CSOM)

string strUrl = ConfigurationManager.AppSettings["SiteUrl"];
string strWebUrl = ConfigurationManager.AppSettings["WebUrl"];
string strListName = ConfigurationManager.AppSettings["ListName"];
string strFieldName = ConfigurationManager.AppSettings["FieldName"];

Microsoft.SharePoint.SPSecurity.RunWithElevatedPrivileges(delegate ()
{
using (SPSite site = new SPSite(strUrl))
{
using (SPWeb web = site.OpenWeb(strWebUrl))
{
web.AllowUnsafeUpdates = true;
SPList list = web.Lists[strListName];
if (list != null)
{
foreach (SPField field in list.Fields)
{
if (field.Title == strFieldName)
{
field.AllowDeletion = true;
field.Delete();
list.Update();
break;
}
}
}
web.AllowUnsafeUpdates = false;
}
}
});

Console.WriteLine("Success");

}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}