Visual Studio 2013 ---- Add button to populate a gridview?

Hey I have a question for any skilled coder's out there? I am having trouble finding an answer to my Visual Studio question. I have a form with fields linked to an "Add New Source" button. I want the data in these field to populate the grid view. Could anyone give me advice? Is so I would be grateful and could you explain what you have done as will have to do it again. Also I am writing in VB. Here is the name of my button and Event name.

   Protected Sub btnAddNewSource_Click(sender As Object, e As EventArgs)

    End Sub

Here is my Button

       <dx:LayoutItem ShowCaption="False" ColSpan="1" Width="10%">
                                <LayoutItemNestedControlCollection>
                                    <dx:LayoutItemNestedControlContainer runat="server">
                                        <dx:ASPxButton ID="btnAddNewSource" runat="server" Text="Add New Source" OnClick="btnAddNewSource_Click" Theme="Office2010Blue">
                                        </dx:ASPxButton>
                                    </dx:LayoutItemNestedControlContainer>
                                </LayoutItemNestedControlCollection>
                            </dx:LayoutItem>

Here is my grid view

      <dx:LayoutItem ColSpan="5" RowSpan="2" ShowCaption="False" Width="100%" HorizontalAlign="Center">
                        <LayoutItemNestedControlCollection>
                            <dx:LayoutItemNestedControlContainer runat="server">
                                <dx:ASPxGridView ID="gridContacts" runat="server" AutoGenerateColumns="False" DataSourceID="CostAndFunding" Theme="Office2010Blue" KeyFieldName="GrantApplicationCycleFundingID" Styles-AlternatingRow-BackColor="Wheat">
                                    <Columns>
                                        <dx:GridViewCommandColumn ShowEditButton="True" ShowInCustomizationForm="True" VisibleIndex="0">
                                        </dx:GridViewCommandColumn>
                                        <dx:GridViewDataTextColumn FieldName="GrantApplicationCycleFundingID" ReadOnly="True" ShowInCustomizationForm="True" Visible="False" VisibleIndex="1">
                                            <EditFormSettings Visible="False" />
                                        </dx:GridViewDataTextColumn>
                                        <dx:GridViewDataTextColumn FieldName="GrantApplicationID" ShowInCustomizationForm="True" Visible="False" VisibleIndex="2">
                                        </dx:GridViewDataTextColumn>
                                        <dx:GridViewDataTextColumn FieldName="GrantApplicationCycleFundingSource" ShowInCustomizationForm="True" VisibleIndex="3">
                                        </dx:GridViewDataTextColumn>
                                        <dx:GridViewDataTextColumn FieldName="GrantApplicationCycleFundingContribution" ShowInCustomizationForm="True" VisibleIndex="4">
                                        </dx:GridViewDataTextColumn>
                                        <dx:GridViewDataTextColumn FieldName="GrantApplicationCycleFundingStatusID" ShowInCustomizationForm="True" Visible="False" VisibleIndex="5">
                                        </dx:GridViewDataTextColumn>
                                        <dx:GridViewDataComboBoxColumn Caption="Funding Status" FieldName="FundingStatusDescription" ShowInCustomizationForm="True" VisibleIndex="6" Width="">
                                            <PropertiesComboBox DataSourceID="Select_FundingStatus" IncrementalFilteringMode="Contains" TextField="FundingStatusDescription" ValueField="FundingStatusID" ValueType="System.Int32">
                                            </PropertiesComboBox>
                                        </dx:GridViewDataComboBoxColumn>
                                        <dx:GridViewDataTextColumn FieldName="GrantApplicationCycleFundingNotes" ShowInCustomizationForm="True" VisibleIndex="7">
                                        </dx:GridViewDataTextColumn>
                                    </Columns>
                                    <Settings ShowFilterRow="True" ShowGroupPanel="true" />
                                    <Styles>
                                        <AlternatingRow BackColor="Wheat">
                                        </AlternatingRow>
                                    </Styles>
                                </dx:ASPxGridView>
                            </dx:LayoutItemNestedControlContainer>
                        </LayoutItemNestedControlCollection>
                    </dx:LayoutItem>

Sorry for big question but I am stuck big time. Thanks in advance for anyone attempting to answer this!