In combobox how can I save current item in "string" var ?

can you let us know what you are binding in combobox?
Are you binding your combo box at design time or run time?
can you share your code for binding combo box, so we can get exact idea on how it wiil do

thanks

thank you my dear , this is my code
 Da = new SqlDataAdapter("Select * From MyData Where Thing='"+comboBox1.Text+"'", cn); 
Da.Fill(Dt);
string id = Dt.Rows[0]["IdThing"].ToString();
string thing = Dt.Rows[0]["Thing"].ToString();
string Price = Dt.Rows[0]["Price"].ToString(); 


so , I want to bring a current item (I mean the item which user select it in combobox) then send it to stored procedure sql to return all it(current item) informations . 

Hi Reyad,
What exactly are you binding with combobox?
if you are binding a simple list of string then 

string str = comboBox1.SelectedItem.ToString();

if not
can u please lets us know what are u binding with your combobx.

I'd use instead:

string a = comboBox1.SelectedItem.ToString();