Accessing a shared db using named Mutex

Question

Hi All

For my application I have some multi threaded c++ dll and a c# exe . Both of them are a sharing a Sqllite db. My c++ dll will inserting data to db and my c# exe displays it in datagrid .

I want to display data from db asynchronously so I am using named Mutex to access the data base. My c# exe has background worker . In Dowork of my backgroundworker I am using a timer to access the DB.

Now my problem is whenever I am trying to update my UI controls my exe is crashing.

This is how I am trying to update my Grid:

if (dgCompanyGrid.InvokeRequired)
{
    //dgCompanyGrid.DataSource = dt;
    GetFromDb(dt);
}
else
{                          
    GetFromDb(dt);

    dgCompanyGrid.DataSource = dt;
    dgCompanyGrid.Refresh();                            
} 


private delegate int GetFromDbDelegate(DataTable dt);
private int GetFromDb(DataTable dt)
{
    try
    {
        if (this.InvokeRequired)
        {
            m_pxlog.WL("Invoke Required");
            this.Invoke(new GetFromDbDelegate(GetFromDb), new object[] { dt });
            return 1;
        }
        else
        {
            m_pxlog.WL("GetFromDb");
            dgCompanyGrid.Refresh();
            if (dt != null)
            {
                this.dgCompanyGrid.DataSource = dt;
                this.dgCompanyGrid.Refresh();
            }                    
            return 1;
        } 
}

After the execution of the above statements my grid is getting refreshed after that it is crashing