Invalid attempt to read when no data is present

Invalid attempt to read when no data is present.

<asp:TextBox ID="TextBox1" runat="server">

<input id="Password1" type="password"  runat="server" />

User1 = TextBox1.Text
Pass1 = Password1.Value.ToString()
    cmdStr = "SELECT ids FROM sessionregister WHERE username=@username AND password=@password;"
    Using conn As New SqlConnection(connStr)
        Using cmd As New SqlCommand(cmdStr, conn)
            conn.Open()
            cmd.Parameters.AddWithValue("@username", User1)
            cmd.Parameters.AddWithValue("@password", Pass1)
            cmd.ExecuteNonQuery()