Unique Asset Code generation.. Please help me solving this error

[Parita Pandya]

//Code is as follows.


 int length = 9999;
        //Merillife sciences Pvt.Ltd
        for (int i = 0; i <= length; i++)
        {
            if (company == "Merillife Sciences Pvt.ltd" && assetcategory == "laptop/desktop")
            {
                string id = Convert.ToString(MLLP - 0001);
                string tmpid = string.Concat("MLLP-", Convert.ToInt32(id.Split('-').GetValue(1)) + 1);
                tmpid = tmpid + i;
                AssetCodeTextBox.Text = tmpid;
            }
        }

Error:: same code MLLP-29999 is being generated