Error In Search Of Mobile No From Data Gird

Question

I want to search mobile no from Grid with selection of ComboBox. Search bar search names but when i code for mobile and cnic this error appeared, error and code as under; (using C# with Access2016 database)

System.Data.EvaluateException: 'Cannot perform 'Like' operation on System.Double and System.String.'

private void txtSearchBar_TextChanged(object sender, EventArgs e)
        {

            if (comboxSearch.Text == "Mobile No")
            {

                DataView dv = dt.DefaultView;

                dv.RowFilter = "MobileNo LIKE '%" + txtSrchBar.Text.ToString() + "%' ";

            }
        }