How to handle negative TimeSpan in silverlight

Question

Hi I have two textboxes. One is the Start time and other is the end time. I need to check whether end time is greater than start time. I tried with Time Span but i need to check for Hours Minutes Second. If it returns with (-) then i need to validate. How to do that. Please find the following code. .cs ==== DateTime dtStartTime = new DateTime(); DateTime dtEndTime = new DateTime(); TimeSpan dtDiff = new TimeSpan(); dtStartTime = Convert.ToDateTime(txtMonStarttime.Text.Trim()); dtEndTime = Convert.ToDateTime(txtMonEndtime.Text.Trim()); dtDiff = dtEndTime - dtStartTime; Here if the dtDiff returns values with negative then i need to check and validate it. Please help. Thanks Vijay

Pravin Ghadge · Answer

Hi Vijay u can also use: DateTime dtStartTime = new DateTime(); DateTime dtEndTime = new DateTime(); TimeSpan dtDiff = new TimeSpan(); dtStartTime = Convert.ToDateTime(txtMonStarttime.Text.Trim()); dtEndTime = Convert.ToDateTime(txtMonEndtime.Text.Trim()); dtDiff = dtEndTime - dtStartTime; if (dtDiff.Days { validatefunction() }

vijay rags · Answer

Hi I tried with the following. As of now its working. But i dont know what was the exact impact in futher. I declared a string variable and check for (-) symbols using contains and validate it. Please let me know whether this approach is correct or not. string timeSpan=string.Empty; DateTime dtStartTime = new DateTime(); DateTime dtEndTime = new DateTime(); TimeSpan dtDiff = new TimeSpan(); dtStartTime = Convert.ToDateTime(txtMonStarttime.Text.Trim()); dtEndTime = Convert.ToDateTime(txtMonEndtime.Text.Trim()); dtDiff = dtEndTime - dtStartTime; timeSpan=Convert.toString(dtDiff); if(timeSpan.Contains('-')) { //Validate Function Call. }