How to display data based on comboboxe selected item value from respective textboxe using c# windows application

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C#3.5

Hello everybody

iwant to dispaly records in gridview based on combobox selected item and choose that respective item value from textbox

example

if(combobox1.selecteditem=="eid")
selectedvalue=texbox1.text;
else if(combobox1.selecteditem=="enmae")
selectedvalue=textbox1.text;

i want to built my query like and my view like this

select eid=combobox1.selecteditem,enmae=combobox1.selecteditem from tbl1 where  eid=textbox1.text and enmae=textbox1.text

anybody give me example site or examples in c# coding plz...