sql server - C# class object error as unassigned local Variable -

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i using visual studio 2013 ans ms sql 2012 database in windows form application c#. stuck error unassigned local variable

private void picturebox3_click(object sender, eventargs e) {     //sqlfunctions obj  = null;     sqlfunctions obj  ;      if (txtbox_loginid.text !="" && txtbox_loginpassword.text !="")     {         if (obj.logincheck(int.parse(txtbox_loginid.text), txtbox_loginpassword.text)== 1)         {             pnl_logincheck.backcolor = color.darkgreen;             lbl_login.forecolor = color.white;             lbl_login.text = "user id , password entered correct";             lbl_login.font = new font(lbl_login.font.fontfamily, 22);         }

when run program got error unassigned local variable. , when initialize 

sqlfunctions obj = null;

i got error unhandled null reference exception @ 

if (obj.logincheck(int.parse(txtbox_loginid.text), txtbox_loginpassword.text)== 1)

any appreciated.

try sqlfunctions obj = new sqlfunctions();


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