asp.net - Conversion from string "" to type 'Boolean' is not valid -


i getting error message in title on login form in asp.net know how can sort out? appreciated

protected sub button1_click(byval sender object, byval e eventargs) handles button1.click   dim conn new mysqlconnection    conn.connectionstring = ("server=localhost;port=3307;user=user;password=password;database=db;")    try      dim sql string = "select * users3 uname = '" & txtuname.text & "' , password = '" & txtpwd.text & "'"      conn.open()      dim cmd new mysqlcommand(sql, conn)     dim reader mysqldatareader = cmd.executereader          reader.read()         dim isvalidlogin boolean         boolean.tryparse(reader.getvalue(1), isvalidlogin)          if isvalidlogin             session("username") = txtuname.text       response.redirect("registerprop.aspx")     else       response.write("invalid login")     end if    catch ex exception     response.write("an error occurred: " & ex.message.tostring())   end try end sub

change:

dim isvalidlogin = reader.getvalue(1)

to:

dim isvalidlogin boolean boolean.tryparse(reader.getvalue(1), isvalidlogin)

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