Convert Srting to date format.

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DateTime

string

convert

I have two textboxes one contains date from database and another is to append time into it.

TextBox Date = new TextBox();
                Date.Text = "11/05/2015"; //dd/MM/yyyy
                TextBox txt1 = new TextBox();
                txt1.Text = "12:00:00";

I have Concatenated the two textboxes to generate standard datetime string as follows.

var str1 = Date.Text+'.'+txt1.Text;

and I have checked that sting is returning the same value i.e. "11/05/2015 12:00:00"

Now I'm converting the string value to datetime.
I'm doing like this.

var d1 = DateTime.ParseExact(str1, "dd/MM/yyyy HH:mm:ss", CultureInfo.InvariantCulture);
var t1 = d1.ToString("MM/dd/yyyy HH:mm:ss");

But every time it shows the error "string was not recognized as a valid DateTime".