save list into viewstate c#

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C#

Hi,

I want to add an item to the list every time the Add button is clicked, but the list is reset after every postback. How can I keep the data in the list between postbacks?

List<KeyValuePair<string, string>> SelList = new List<KeyValuePair<string, string>>();

for (int r = 0; r <= arrAdd.Length - 1; r++)
{
if (arrAdd[r, 0] == c.ID)
{
SelList.Insert(fldCount, new KeyValuePair<string, string>(arrAdd[r, 1], c.ID));
fldCount += 1;
break;
}
}

Thanks