Save as Dialog

Question

I have some code which saves my datagrid to the 'C' directory as csv and it works fine.

The problem is I have to hard code the directory and I would like to use the save file dialog to do the same task.

It's nearly working but for some reason when I click save the below code throws up another save as window, I have a feeling I have doubled up on something.... Is there another way I should be coding the below within the save as dialog?

             string CsvFpath = saveFileDialog1.FileName;
            System.IO.StreamWriter csvFileWriter = new StreamWriter(CsvFpath, false);

            if (saveFileDialog1.ShowDialog() == DialogResult.OK)
            {
               
                try
                {
                  

                    string columnHeaderText = "";

                    int countColumn = dataGridView1.ColumnCount - 1;

                    if (countColumn >= 0)
                    {
                        columnHeaderText = dataGridView1.Columns[0].HeaderText;
                    }

                    for (int i = 1; i <= countColumn; i++)
                    {
                        columnHeaderText = columnHeaderText + ',' + dataGridView1.Columns [i].HeaderText;
                    }

                    csvFileWriter.WriteLine(columnHeaderText);

                    foreach (DataGridViewRow dataRowObject in dataGridView1.Rows)
                    {
                        if (!dataRowObject.IsNewRow)
                        {
                            string dataFromGrid = "";

                            dataFromGrid = dataRowObject.Cells[0].Value.ToString();

                            for (int i = 1; i <= countColumn; i++)
                            {
                                dataFromGrid = dataFromGrid + ',' + dataRowObject.Cells[i].Value.ToString();

                            }
                            csvFileWriter.WriteLine(dataFromGrid);
                        }
                    }

                    csvFileWriter.Flush();
                    csvFileWriter.Close();

                    MessageBox.Show("Export successful");
                }