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POHow to delete the data for a student in the array and list box, and keep the array and listbox synchronized
 

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  1. POHow to delete the data for a student in the array and list box, and keep the array and listbox synchronized
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    <p>I have a 2 dimensional array, and a add button to add values from a text box into a list box and I have a delete button to delete a selected value from the list box and the array.</p> <p>this line of code won't work because its a 2 dimensional array.</p> <p>names[lstindex] = null;</p> <pre><code> string[,] names = new string[10,3]; const int STUDENT_NAME = 0; const int STUDENT_ID = 1; const int MAJOR = 2; private void btnExit_Click(object sender, EventArgs e) { Close(); } private void AssignArray(int Row) { names[Row,STUDENT_NAME] = txtStudentName.Text; names[Row, STUDENT_ID] = txtStdBox.Text; names[Row, MAJOR] = txtMJbox.Text; } private string BuildStudent(int Row) { string answser = ""; int UpperLimit = names.GetUpperBound(1); for (int column = 0; column &lt;= UpperLimit; column++) { answser += names[Row, column] + ""; } return answser; } private void btnAdd_Click(object sender, EventArgs e) { //find location to use array int position = lstStudents.Items.Count; AssignArray(position); lstStudents.Items.Add(BuildStudent(position)); names[position,MAJOR] = txtMJbox.Text; //find last valid subscript int maxIndex = names.GetUpperBound(0); //if using last valid subscript disable add button if (position == maxIndex) { btnAdd.Enabled = false; } } private void btnUpdate_Click(object sender, EventArgs e) { int index = lstStudents.SelectedIndex; if (index != -1) { //update array AssignArray(index); //names[index, STUDENT_NAME] = txtStudentName.Text; //remove old entry lstStudents.Items.RemoveAt(index); //put a new entry in that spot lstStudents.Items.Insert(index,names[index, STUDENT_NAME]); //highlight entry for user lstStudents.SelectedIndex = index; } else { MessageBox.Show("seleect student, then click update","error"); } } private void btnDelete_Click(object sender, EventArgs e) { int lstindex = lstStudents.SelectedIndex; //Delete the data for a student in the array //and listbox, and keep the array and listbox synchronized. names[lstindex] = null; lstStudents.Items.RemoveAt(lstindex); } </code></pre>
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