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How to remove an element from an array and resize the array

I want to remove a specific object from an array, put it in a smaller array without getting out of range. This is what I've tried but it won't work.
Skateboard[] newSkateboard = new Skateboard[_skateboards.Length - 1];
for (int i = 0; i < _skateboards.Length; i++)
{
if (skateboard.Code != _skateboards[i].Code)
{
newSkateboard[i] = _skateboards[i];
}
}

Sure.
var j = 0;
for (int i = 0; i < _skateboards.Length; i++)
{
if (skateboard.Code != _skateboards[i].Code)
{
newSkateboard[j] = _skateboards[i];
j = j + 1;
}
}

Unsort a listbox in c# winform

I am very new programmer, the user is able to input vales into a ListBox, there is also a option button where the user can sort the numbers in ascending order. However I am also asked to create a option button to unsort back into its original form, however I am not sure how I would do this. I am trying to do this without the use of any containers/arrays. here is my code to sort:
private void sorted()
{
int a = lstHoldValue.Items.Count;
for (int i = 0; i < a - 1; i++)
{
var k = 0;
for (var j = 1; j < a - i; j++)
{
if (Convert.ToInt32(lstHoldValue.Items[j]) < Convert.ToInt32(lstHoldValue.Items[k]))
{
var temp = lstHoldValue.Items[j];
lstHoldValue.Items[j] = lstHoldValue.Items[k];
lstHoldValue.Items[k] = temp;
k = j;
}
else
{
k++;
}
}
}
}

How to reverse rows in a DataGridView

I am using a data grid, but the values do not display as I would like them to. My current code is below, how would I go about inverting the rows?
string[] strOutput = strLine.Split('_', ',','=');
int totalRows = Convert.ToInt16(strOutput[4]);
int totalCols = Convert.ToInt16(strOutput[5]);
int itemIndex = 8;
for (int i = 0; i < totalCols; i++){
dataGridView1.Columns.Add("Col", "Col");
}
dataGridView1.Rows.Add(totalRows);
for (int i = 0; i < totalRows; i++) {
for (int j = 0; j < totalCols; j++) {
dataGridView1.Rows[i].Cells[j].Value = strOutput[itemIndex];
itemIndex += 2;
}
}
dataGridView1.Visible = true;

To invert i.e. reverse DataGridViewRows you can use this:
void ReverseDGVRows(DataGridView dgv)
{
List<DataGridViewRow> rows = new List<DataGridViewRow>();
rows.AddRange(dgv.Rows.Cast<DataGridViewRow>());
rows.Reverse();
dgv.Rows.Clear();
dgv.Rows.AddRange(rows.ToArray());
}
If you only need to do it once you could instead either:
loop over the lines of the source file in reverse
or instead of Adding the rows (to the end) Insert at the top:
dtnew.Rows.Insert(0, currentDataRowView.Row);

Inverting rows:
"DataGridView.Rows".- will give you "DataGridViewRowCollection"
Iterate the collection in reverse order and create a new datatable. (for loop from max size to zero)
Assign the new datatable to datagridview source.
This rough code written in note pad for your idea. I do not have IDE now.
DataGridViewRowCollection dgRowColllection = dataGridView1.Rows;
DataTable dtnew = new DataTable();
for(i = dataGridView1.RowCount; i < 1 ; i--)
{
DataRowView currentDataRowView = dgRowColllection[i].Row;
dtnew.Rows.Add(currentDataRowView.Row);
}
dataGridView1.source = dtnew;

Can't comment on Pavan's answer because I don't have 50 reputation, but are you getting the error because the loop should be something like:
int totalRows = Convert.ToInt16(strOutput[4]);
int totalCols = Convert.ToInt16(strOutput[5]);
int itemIndex = 8;
for (int i = 0; i < totalCols; i++)
{
dataGridView1.Columns.Add("Col", "Col");
}
dataGridView1.Rows.Add(totalRows);
for (int i = 0; i < totalRows; i++)
{
for (int j = 0; j < totalCols; j++)
{
dataGridView1.Rows[i].Cells[j].Value = strOutput[itemIndex];
itemIndex += 2;
}
DataGridViewRowCollection dgRowColllection = dataGridView1.Rows;
DataTable dtnew = new DataTable();
for (i = dataGridView1.Items.Count; i < 1; i--)
{
DataRowView currentDataRowView = dgRowColllection[i].Row;
dtnew.Rows.Add(currentDataRowView.Row);
}
dataGridView1.DataSource = dtnew;
}
dataGridView1.Visible = true;
}

Add row to specific column by header name/text

I have a column named "HeaderText_Name" and in this column, I want to add a row that has the text "Row" under that column.
I attempted to write some pseudo-code for it
databaseGridView.Rows["HeaderText_Name"].Add("Row");
If I do
databaseGridView.Rows.Add("Row");
It adds it to the first column no matter what. I also can't do something like
databaseGridView.Rows.Add("","","Row");
Then it adds blanks to the first two columns and I also don't know how which index the column is. So I would be more helpful if it was by Name or text.
Here is the actual code I have so far..
for (int i = 0; i < completeInfoMatches.Count; i++) {
databaseGridView.Rows.Add();
databaseGridView.Rows[0].Cells[e.Node.Text].Value = completeInfoMatches[i].Groups[1].ToString();
}
Now, completeInfoMatches has more than 1 match because it's regex. How can I change the 0 to make it work?
UPDATE
int currentRowIndex = 0;
databaseGridView.Columns.Add(e.Node.Text.Replace(" ", string.Empty), e.Node.Text);
for (int i = 0; i < completeInfoMatches.Count; i++) {
databaseGridView.Rows.Add();
databaseGridView.Rows[currentRowIndex].Cells[e.Node.Text.Replace(" ", string.Empty)].Value = completeInfoMatches[i].Groups[1].ToString();
currentRowIndex = currentRowIndex + 1;
}
I'm getting a lot of extra blank rows because of Row.Add

Try something like this:
foreach(int i = 0; i < completeInfoMatches.Count; i++){
var index = databaseGridView.Rows.Add();
databaseGridView.Rows[index].Cells[e.Node.Text].Value = completeInfoMatches[i].Groups[1].ToString();
}

With the help of #Forlani ...
int currentRowIndex = 0;
int actualRowIndex = databaseGridView.Rows.Count;
for (int i = 0; i < completeInfoMatches.Count; i++) {
var index = 0;
if (actualRowIndex < completeInfoMatches.Count) {
index = databaseGridView.Rows.Add();
}
databaseGridView.Rows[currentRowIndex].Cells[e.Node.Text.Replace(" ", string.Empty)].Value = completeInfoMatches[i].Groups[1].ToString();
currentRowIndex = currentRowIndex + 1;
}

Getting System.ArgumentOutOfRangeException while copy between two Datagridviews

If somebody could please help solve the following issue:
System.ArgumentOutOfRangeException : Index was out of range. Must be
non-negative and less than the size of the collection. Paarameter name
: index
The code:
for (int i = 0; i <= dataGridView2.Rows.Count ; i++)
{
for (int j = 0; j <= dataGridView3.Rows.Count; j++)
{
if (!string.IsNullOrEmpty(dataGridView2.Rows[i].Cells["supplier_name"].Value as string) && !string.IsNullOrEmpty(dataGridView3.Rows[j].Cells["brands_supplier"].Value as string))
{
if (dataGridView2.Rows[i].Cells["supplier_name"].Value.ToString() == dataGridView3.Rows[j].Cells["brands_supplier"].Value.ToString())
{
dataGridView2.Rows[i].Cells["brands_name"].Value += dataGridView3.Rows[j].Cells["brands_nume"].Value + " ";
}
}
else
{
break;
}
}
}

You try to access an element of your datagrid which doesn't exist.
You have to set your for condition to
for (int i = 0; i < dataGridView2.Rows.Count ; i++)
and
for (int j = 0; j < dataGridView3.Rows.Count; j++)
don't use <= because the index of dataGridView.Rows[] is 0 based.
For example, if your datagrid contains 3 elements you can reach them with:
var row1 = dataGrid.Rows[0]
var row2 = dataGrid.Rows[1]
var row3 = dataGrid.Rows[2]
And you try to access
var row4 = dataGrid.Rows[3] // Error because this item doesn't exist (System.ArgumentOutOfRangeException)
also, but this item doesn't exist

I think problem in cycle
for (int i = 0; i <= dataGridView2.Rows.Count ; i++)
You run one more time
use
for (int i = 0; i < dataGridView2.Rows.Count ; i++)