Filter w.r.t dates and write to excel from datagrid.

Hi Team,
I am trying to put a filter with input dates (From and To) before writing to excel as output.
I tried the below logic but it is writing all the data as it is in Grid to Excel. I am unable to go ahead.

Appreciates if someone can help me doing this?



The Grid displays as below :
Dates      Name     School Place
5/13/15    Shreyas    ABC   BLR
4/12/15    Amit      XYZ   MYS
6/24/15    Niraj     MES   BJP
11/10/15   Akshay    NIT   ENG
8/26/15    Natraj    GVC   BGK


Expected :
Examaple if the DateFrom : 5/13/15 and DateTo : 6/24/15.The output expected is :
Dates      Name     School Place
5/13/15    Shreyas    ABC   BLR
6/24/15    Niraj     MES   BJP

void WriteToExcel(DateTimePicker DateFrom,DateTimePicker DateTo)
 {            
        ExcelWriter exlWtr = new ExcelWriter();    
        int rows = Grid.RowCount + 1;
        int cols = Grid.ColumnCount;
        if (rows == 0 || cols == 1)
             return;                 

        string[] colNames = new string[cols];
        //  Populate the Header names first
         int i = 0;
         for (int colItr = 0; colItr < cols; j++)
         {
			if (Grid.Columns[j].Visible)
            {
                  colNames[i] = Grid.Columns[j].Name;
                  i++;
            }
         }
          object[,] values = new object[rows, i];
          //Copy the  Column names
          for (int j = 0; j < i; j++)
          {
             values[0, j] = Grid.Columns[colNames[j]].HeaderText; 
          }
          //Get the data now
           foreach (DataGridViewRow row in Grid.Rows)
           {
               for (int j = 0; j < i; j++)
               {
                    //Grid[colNames[0], j].FormattedValue; 	// This displays the dates from the Grid
					//May be here i need to add the logic to filter with dates and write
                    values[row.Index + 1, j] = Grid[colNames[j], row.Index].FormattedValue;                   
               }
           }
           exlWtr.createFile(false);
           exlWtr.writeRange(1, 1, 1, values);  // Writes to Excel
           exlWtr.SetHorizontalAllignment(1, 1, Grid.Rows.Count + 1, i, "LEFT");
           exlWtr.SetVisibility(true);
          
  }