With second unit
The small white for help

CodePudding user response:

For the first time in the button click access time save, when click the second time, get the latest time, compare!

CodePudding user response:

 
DateTime t1, t2; 
Private void button1_Click (object sender, EventArgs e) 
{

T2=DateTime. Now; 
If (t1!!!=a DateTime. MinValue) 
{
MessageBox. Show ((t2 - t1). The ToString ()); 
} 
The else 
{
MessageBox. Show (" for the first time, click on "); 
} 
T1=t2; 
} 

CodePudding user response:

refer to the second floor of autumn red fruit response:

 
DateTime t1, t2; 
Private void button1_Click (object sender, EventArgs e) 
{

T2=DateTime. Now; 
If (t1!!!=a DateTime. MinValue) 
{
MessageBox. Show ((t2 - t1). The ToString ()); 
} 
The else 
{
MessageBox. Show (" for the first time, click on "); 
} 
T1=t2; 
} 

cut out for a second

CodePudding user response:

MessageBox. Show ((t2 - t1). Seconds . The ToString ());