What is wrong in my code?

[vknow360]

@AppDeveloper

But i put the message to be list view 1. selection and the title to be the date

...and both are same thing i.e. DateLabel.Text.
Because ListView elements are tags which were set from DateLabel.Text.

@AppDeveloper

what should i put instead of listview1.selection

You should get tags value and put it there.