c#

Question

how can i validate the dateformat(mm/dd/yyyy) in a textbox using C#

Shivshanker Cheral · Answer

Just try dd/mm/yyyy Format In regular Expression (optional mm,optional dd) ([1-9]|0[1-9]|[12][0-9]|3[01])[- /.]([1-9]|0[1-9]|1[012])[- /.][0-9]{4}$ mm/dd/yyyy (optional mm,optional dd) ^([1-9]|0[1-9]|1[012])[- /.]([1-9]|0[1-9]|[12][0-9]|3[01])[- /.][0-9]{4}$ mm/dd/yyyy (Exact Format) ^([01]\d)/([0-3]\d)/(\d{4})$ OR Try this function private void DateSubmit_Click(object sender, System.EventArgs e) { DateTime date1, date2; bool date1OK, date2OK; date1 = new DateTime(1,1,1); date2 = new DateTime(1,1,1); try { date1 = Convert.ToDateTime(Date1.Text); date1OK=true; } catch { date1OK = false; } try { date2 = Convert.ToDateTime(Date2.Text); date2OK=true; } catch { date2OK = false; } if(date1OK && date2OK) { if(date1.CompareTo(date2) > -1)lblResult.Text = "Date2 must be after Date1"; else { //do whatever here } } else lblResult.Text = "Invalid date format. Please check your input in the Date1 and Date2 fields"; }

c#

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