private string AppendSpace(string label=null,int snum=SPACENUM1 )
{
StringBuilder rtn=new StringBuilder();
if(string.IsNullOrEmpty(label )){
rtn.Append(' ', snum);
return rtn.ToString();
}
int len = label.Length;
if (label.Length > snum)
return label;
rtn.Append(label).Append(' ', snum - len);
return rtn.ToString();
}