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How to get column header with non empty data in row?

I have a 15x15 dataGridView which on creation has empty (has no values) cells. Then, after user input the data, I want to get the column header which has non empty data in its row. I've been trying the following code:
DataTable dt = new DataTable();
foreach (DataGridViewColumn col in dataGridView1.Columns)
{
bool empty = true;
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (row.Cells[col.Index].Value!=null)
{
empty = false;
break;
}
}
if (empty == false)
{
dt.Columns.Add(col.HeaderText);
}
}
However, it doesn't appear to be working.

DataTable dt = new DataTable();
foreach (DataGridViewColumn col in dataGridView1.Columns)
{
bool empty = false;
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (row.Cells[col.Index].Value.ToString() == string.Empty)
{
empty = true;
}
break;
}
if (empty == false)
{
dt.Columns.Add(col.HeaderText);
}
}

how select multiple row using shift and Ctrl key in datagridview C#

My requirement : In datagridview I need select row by clicking the row header and selected row should maintain until I will click the other row header also same time I should select cell too.
My Problem : I can't select multiple row using Shift and Ctrl key.
my code :
List< DataGridViewRow> selectedRows = new List< DataGridViewRow>();
void selectRows()
{
dataGridView1.SuspendLayout();
foreach (DataGridViewRow r in dataGridView1.Rows)
{
r.Selected = selectedRows.Contains(r);
}
dataGridView1.ResumeLayout();
}
private void dataGridView1_RowHeaderMouseClick(object sender,DataGridViewCellMouseEventArgs e)
{
DataGridViewRow clickedRow = dataGridView1.CurrentRow;
if (selectedRows.Contains(clickedRow))
{
selectedRows.Remove(clickedRow);
}
else
{
selectedRows.Add(clickedRow);
}
selectRows();
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if ((row.Index != e.RowIndex) && !row.Selected)
{
row.DefaultCellStyle.BackColor = Color.White;
}
else
{
selectedRows.Remove(clickedRow);
row.Selected = true;
row.DefaultCellStyle.BackColor = Color.Blue;
}
}
}
private void dataGridView1_CellClick(object sender, DataGridViewCellEventArgs e)
{
foreach (DataGridViewRow row in dataGridView1.Rows)
{
if (row.DefaultCellStyle.BackColor == Color.Blue)
{
row.Selected = true;
}
}
}

You have to set your enable your datagridview's multiselect dataGridView.MultiSelect = true;

Be familiar with using a debugger, you will be able to find out where the issue is.
You are clearing the selection in your loop
foreach (DataGridViewRow row in dataGridView1.Rows)
{
}
Rethink the if-else logic in it and you will see why. You are clearing your previous selections when you are not suppose to.

DataGridView Multiple Selected Columns get both row data

Thanks StackOverflow !
The Below code is intended to selected and run through each row.
foreach (DataGridViewRow row in RGV.Rows)
{
foreach (DataGridViewCell cell in row.Cells)
{
if (RGV.SelectedColumns.Contains(cell.OwningColumn))
{ row.Cells["Status"].Value = "OK"; }
else
{ row.Cells["Status"].Value = "Check"; }
}
}

There is couple of errors in your code. First, you are trying to assign a DatagridViewColumn to a DatagridViewRow, which is build-able but i really dont know how it will react.
As answer to your question i would suggest something like this:
foreach (DataGridViewRow row in RGV.Rows)
{
foreach (DataGridViewCell cell in row.Cells)
{
row.Cells["Status"].Value = "Check";
if (RGV.SelectedColumns.Contains(cell.OwningColumn))
{
row.Cells["Status"].Value = "OK";
break;
}
}
}
I hope i helped you somehow.

Finding datagridview cell type in C#?

i am trying to find each DatagridviewImageCell and set its property ImageLayout to DataGridViewImageCellLayout.Zoom so the image in that cell will be zoomed. I am using this code, but am getting an error: Unable to cast object of type 'System.Windows.Forms.DataGridViewRow' to type 'System.Windows.Forms.DataGridViewImageCell'. here: (DataGridViewImageCell Imgrow in dataGridView1.Rows. This is the code i am using.
foreach (DataGridViewImageCell Imgrow in dataGridView1.Rows)
{
if (dataGridView1.Rows[a].Cells[1].Value == "Image")
{
Imgrow.ImageLayout = DataGridViewImageCellLayout.Zoom;
}
}
How do i fix it? Also, the column is a texbox column, but i am using this to replace the cell.
int a = 0;
dataGridView1.Rows.Insert(0, 1);
dataGridView1.Rows[a].Cells["Column1"] = new DataGridViewImageCell();
dataGridView1.Rows[a].Cells["Column1"].Value = picturebox1.Image;

You need to loop over the rows with a row object, and then loop over the cells with a cell object.
Something like this:
foreach (DataGridViewRow dr in dataGridView1.Rows) {
foreach (DataGridViewCell dc in dr.Cells) {
if (dc.GetType() == typeof(DataGridViewImageCell)) {
((DataGridViewImageCell)dc).ImageLayout = DataGridViewImageCellLayout.Zoom;
}
}
}

Code to clear DataGridView

See code below:
foreach (DataGridViewRow r in dgvStatus.Rows)
{
foreach (DataGridViewCell c in r.Cells)
{
c.Value = "";
}
}
Pretty simple, clears all the values. But I need to make some modifications to it and don't know how to go along.
I want it to clear all the values, except for the first cell in every column. Also, some cells contain checkboxes and not textboxes, how can I make a check for this?
Thanks

Try this:
foreach (DataGridViewRow r in dgvStatus.Rows) {
if (r.Index == 0) {
continue;
}
foreach (DataGridViewCell c in r.Cells) {
if c.OwningColumn is DataGridViewCheckBoxColumn) {
continue;
}
c.Value = "";
}
}