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i am able to remove the user from site collection using in this way:-

SPWeb.SiteUsers.Remove("providername:" + this.txtOldName.Text);

but found the same user existing in All People how to remove user from All People programmatically

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up vote 1 down vote accepted

i fixed the issue using

oldUser = oWeb.SiteUsers["providername:" + this.txtOldName.Text];
int id = oldUser.ID;

oWeb is the object of SPWeb

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