i have a form that calculate student marks and grade. there is one text box on the form which am finding it difficult reset or clear the text in that textbox. i just double clicked the text box put this code behind it. it is working alright but i cant use
this.txtFcs_exams.Text = "";
to clear the textbox. please help me out. when clearing the screen i get an error message "input string was not in a correct format"
private void txtFcs_exams_TextChanged(object sender, EventArgs e) { try { double classworkFcs, iaFcs, examsFcs, totalsFcs; classworkFcs = Convert.ToDouble(txtFcs_classwork.Text); iaFcs = Convert.ToDouble(txtFcs_ia.Text); examsFcs = Convert.ToDouble(txtFcs_exams.Text); totalsFcs = classworkFcs + iaFcs + examsFcs; txtFcs_totals.Text = totalsFcs.ToString(); if (totalsFcs >= 75) { txtFcs_grading.Text = " A"; } else if (totalsFcs >= 70) { txtFcs_grading.Text = " B"; } else if (totalsFcs >= 65) { txtFcs_grading.Text = " C"; } else if (totalsFcs >= 55) { txtFcs_grading.Text = " D"; } else if (totalsFcs >= 45) { txtFcs_grading.Text = " E"; } else { txtFcs_grading.Text = " F"; } } catch (System.FormatException fmtE) { MessageBox.Show(fmtE.Message); } }