DataGridView Changing DataSource Dynamically

Question

Basically when I create this DataGridView I have this code to fill it up

public void fillDataGrid(IQueryable<PatientInfo> patients) {

            dgvMyPatients.DataSource = patients;

            dgvMyPatients.Columns["Pat_Last_Name"].DisplayIndex = 0;
            dgvMyPatients.Columns["Pat_First_Name"].DisplayIndex = 1;
            dgvMyPatients.Columns["Pat_Middle_Name"].DisplayIndex = 2;
            dgvMyPatients.Columns["Pat_First_Name"].HeaderText = "First Name";
            dgvMyPatients.Columns["Pat_Last_Name"].HeaderText = "Last Name";
            dgvMyPatients.Columns["Pat_Middle_Name"].HeaderText = "Middle Name";

        }

public IQueryable<PatientInfo> showMyPatients() {

            DbClassesDataContext myDb = new DbClassesDataContext(dbPath);

            var patientInfo = from patients in myDb.PatientInfos
                              where patients.Phy_ID == physcianID
                              select patients;

            return patientInfo;
        }

So when I create my Object I just do this

fillDataGrid(showMyPatients());

But When I click a button I want to change its contents to something like in this query

 private IQueryable<PatientInfo> searchPatient() {

        DbClassesDataContext myDb = new DbClassesDataContext(dbPath);
        var search = from myPatients in myDb.PatientInfos
                     where (myPatients.Pat_ID == patient_ID && myPatients.Pat_First_Name.Contains(txtSearch.Text)) ||
                     (myPatients.Pat_ID == patient_ID && myPatients.Pat_Last_Name.Contains(txtSearch.Text)) ||
                    (myPatients.Pat_ID == patient_ID && myPatients.Pat_Middle_Name.Contains(txtSearch.Text))
                     select myPatients;

        return search;
    }

Then when I click my button It will do this, but it is not updating the datagrid why is that? fillDataGrid(searchPatient());

Solution 1

I had the same problem, after searched and tested a while, finally found the solution:

        DataTable dt = new DataTable();
        dt.Columns.Add("Column One");

        dt.Rows.Add(new object[] { "Item1" });
        dt.Rows.Add(new object[] { "Item2" });
        dt.Rows.Add(new object[] { "Item3.3" });

        this.dataGridView1.AutoGenerateColumns = true;
        this.dataGridView1.Columns.Clear();

        //dataGridView1.DataSource = null;
        dataGridView1.DataSource = dt;

AutoGenerateColumns needs be true, that's it.

Solution 2

Instead if doing

DataSource = null

its better to refresh the currency manager, given IQueryable returns CurrencyManager:

 (dgvMyPatients.BindingContext[dataGridView1.DataSource] as CurrencyManager).Refresh();

CurrencyManager

CurrencyManager.Refresh()