How do I save dataset data in C#?

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C#

Visual-Studio

application

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Hello,

I'm a fairly new programmer and I am working on a windows Application in C#. I have created a grid view which is bound to a local DataSet. There is no sql server, this is strictly local DataSet.

I have written the event handler code for the save button that I added on the binding navigator. Can someone please look over my code and let me know where I have gone wrong?

private void SaveButton_Click_1(object sender, EventArgs e)
{
    try
    {

        dataTable1BindingSource1.EndEdit();

        App.DataTable1.WriteXml(string.Format("{0}//data.dat", Application.StartupPath));

        MessageBox.Show("Save Complete");
        groupBox3.Enabled = false;
        grpBxReportedBy.Enabled = false;
        groupBox1.Enabled = false;
        App.DataTable1.AcceptChanges();

    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, "Messages", MessageBoxButtons.OK, MessageBoxIcon.Error);
        App.DataTable1.RejectChanges();
    }
}



static DataSet1 db;
protected static DataSet1 App
{
    get
    {
        if (db == null)
            db = new DataSet1();
        return db;
    }
}

private void FascilitiesMaint2018_Load(object sender, EventArgs e)
{

    string fileName = string.Format("{0}//data.dat", Application.StartupPath);
    if (File.Exists(fileName))
    {
        App.DataTable1.ReadXml(fileName);

    }

    dataTable1BindingSource1.DataSource = App.DataTable1;
    groupBox3.Enabled = false;
    grpBxReportedBy.Enabled = false;
    groupBox1.Enabled = false;


}

What I have tried:

I have edited my code numerous times to try to fix the issue but I can't get it to save.
I had a overload error previously which I managed to fix.
I've spent hours trying to look up tutorials on saving with DataSets but all I find are SQL DataSets.