why this not incremention....rectidy error

List<values> listvalue = new List<values>();
int t=0;
int m = 0;
int p = 0;
values value = new values();
while(p < data.Length - 1)
{

if (splitdata[p].Contains("ABC"))
{
pno = splitdata[p].Substring(42, 11);
pn=Convert.ToInt32(pno);
value.partno = pn.ToString();
while (m < data.Length - 1)
{
if (splitdata[m].Contains("DEF"))
{
mno = splitdata[m].Substring(42, 11);
mn=Convert.ToInt32(mno);
value.matno=mn.ToString();
while (t < data.Length - 1)
{
if (splitdata[t].Contains("GHI "))
{
sno = splitdata[t].Substring(42, 11);
sn = Convert.ToSingle(sno);
value.thickness = sn.ToString();
}
t=t+1;
}
}
m = m + 1;
}
listvalue.Add(value);
}
p = p + 1;
}

here "p" value alone incrementing in listvalue..
m and t gives last value..not incrementing.y?