How to get the time-span of all the datetime data in my datagridview

Question

The scenario go\'s like that, above and this; I have a database, which I displayed on my datagridview. I already added the timespan of each row (timeIn and timeOut<

Answer 1

According to the information you have provided

You need to iterate through every row of a Grid. You have to do something like this:

DateTime TotalTimeOfAllRows;

for (c= 0; c < DataGridView1.Rows.Count; c++)
{
    DateTime timeIn = DataGridView1.Rows[c].FindControl("txtTimeIn").Text;
  DateTime timeOut = DataGridView1.Rows[c].FindControl("txtTimeOut").Text;
  // Here Compute Datetime TotalTime
  DataGridView1.Rows[c].FindControl("txtTotalTime").Text = TotalTime.ToString();

  // Here Add TotalTime to TotalTimeOfAllRows     

}
//If TotalTimeOfAllRows Textbox is in Datagridview too
 DataGridView1.Rows[DataGridView1.Rows.Count-1].FindControl("txtTotalTimeOFAllRows").Text = TotalTimeOfAllRows.ToString();