To Save After revising a new data to replace the value of the key in key value pair

Question

Here in Forms Application I used a button object so that on clicking the button the data entered in the text box1 should replace with the data of the key value which is going to read the text file & also to replace the related data in the same file to the same key value pair in which we selected in the combobox

To be frank on Viewing or running this application u can understand the way to solve the problem behind this

could u please help me to solve this problem

Thank You

Attachment: filereadformsauto.rar

Vulpes · Answer

The code in your comboBox2.SelectedIndexChanged handler should be as follows: private void comboBox2_SelectedIndexChanged(object sender EventArgs e) { key = String.Empty; // reset to empty on each change try { if (tab == null) // if Hashtable not yet loaded { tab = new Hashtable(); // now refers to field lines = File.ReadAllLines(path); // now refers to field foreach (string line in lines) { if (line.Contains(=)) { string[] items = line.Split('='); tab.Add(items[0] int.Parse(items[1])); } } } // close the if statement here if (tab.ContainsKey(comboBox2.SelectedItem.ToString())) { key = comboBox2.SelectedItem.ToString(); textBox1.Text = tab[key].ToString(); } else { MessageBox.Show(Invalid Key or Command Entered....
Please Enter A Valid Command.); } } catch (Exception Ex) { MessageBox.Show(Ex.Message); } }