Update Button in a gridview

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C#

Hi I have loaded buttons in my grid view to update data, secondly I have a combobox that filters information in my grid view.
Now if I filtered information in my gridview and try to update filtered data in the grid, application throws error exception . That says “Input error not in a correct format”

Now why does it have to throw that error message only when updating filtered data from the gridview??:confused:


Below is the code when a button to edit is clicked in my gridview.

#region Edit button handling for grvScheduledCourses in "View Scheduled Courses" Tab
        private void grvScheduledCourses_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {
           
            int currentRow = int.Parse(e.RowIndex.ToString());
            try
            {
                string courseNoString = grvScheduledCourses[0, currentRow].Value.ToString();
                //****Format Error Exception occurs here****
                courseNo = int.Parse(courseNoString);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        
            if (grvScheduledCourses.Columns[e.ColumnIndex] == btnEdit && currentRow >= 0)
            {
                string courseCode = grvScheduledCourses[1, currentRow].Value.ToString();
                string StartDate = grvScheduledCourses[2, currentRow].Value.ToString();
               
                string name = grvScheduledCourses[6, currentRow].Value.ToString();
                string email = grvScheduledCourses[7, currentRow].Value.ToString();
                //runs frmAssignTrainer to edit trainers
                frmAssignTrainer f2 = new frmAssignTrainer();
                f2.courseCode = courseCode;
                f2.StartDate = StartDate;
                
                f2.name = name;
                f2.email = email;
                
                f2.courseNo = courseNo;
                f2.Show();
                grvScheduledCourses.Update();
                
            }
           
         }
        #endregion