how to update the look up fields in list

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SharePoint2013

Hi,

I have a list that contains 3 lookup fields , i was trying to update the list item through custom webpart, but only one lookup field is getting updated rest fields are empty.

here the code iam using:

SPListItem itms = list.AddItem();
                           web.AllowUnsafeUpdates = true;
                           SPFieldLookupValue value1= new SPFieldLookupValue(Convert.ToInt32(row.Cells[0].Text) ,row.Cells[0].Text);
                           itms["ClientID"] = value1;

                           SPFieldLookupValue value2=new SPFieldLookupValue(Convert.ToInt32(row.Cells[1].Text), row.Cells[1].Text);
                           itms["ManagerID"] = value2;

                           SPFieldLookupValue value3 = new SPFieldLookupValue(Convert.ToInt32(row.Cells[2].Text), row.Cells[2].Text);
                           itms["RecruiterID"] = value3;

                           SPFieldLookupValue value4 = new SPFieldLookupValue(Convert.ToInt32(drps.SelectedValue.ToString()), drps.SelectedValue.ToString());
                           itms["RequirementID"] = value4;

                           itms.Update();
                           web.AllowUnsafeUpdates = false;

only the ClientID is getting updated

what could be the reason please help.

thanks
Ginnas