How to validate DataGridView

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C#

In my programme when i click a particular row in DataGridView, if that row is having "\" it should pop up an error message that "\ is not allowed in name or in path". I dont how to do that.

Here is the code:

namespace OVF_ImportExport
{
    public partial class Form1 : Form
    {

        string sName = "";
        string sPath = "";
                public Form1()
        {
            InitializeComponent();
        }private void dataGridView1_CellMouseClick(object sender, DataGridViewCellMouseEventArgs e)
        {
                
            foreach (DataGridViewRow row in dataGridView1.SelectedRows)
            {
                 sName = row.Cells[0].Value.ToString();
                 sPath = row.Cells[1].Value.ToString();

            }
        }
 private void BtnCreate_Click(object sender, EventArgs e)
        {
            richTextBox1.Text = "";
            StreamWriter file = new StreamWriter("Export.bat");
            file.WriteLine("c: ");
            file.WriteLine("cd \\");
            file.WriteLine("cd Program Files ");
            file.WriteLine("cd VMware");
            file.WriteLine("cd VMware OVF Tool");

            foreach (DataGridViewRow row in dataGridView1.SelectedRows)
            {
                 sName = row.Cells[0].Value.ToString();
                 sName = sName.Trim();
                 sPath = row.Cells[1].Value.ToString();

              file.WriteLine("start ovftool.exe --powerOffSource vi://" + TxtUsername.Text + ":" + TxtPassword.Text + "@"
                   + TxtIP.Text + sPath + " " + "\"" + TxtBrowsepath.Text + "\\" +  sName + "\\" + sName + ".ovf" + "\"" + Environment.NewLine);

               
                
            }
            file.WriteLine("pause");
            MessageBox.Show("Batch File Created","Batch File");
            file.Close();
        }