how to use multiple database connection?

Question

hello
     I m using multiple database name in master page?It is not working?single database only working?my code is it..
C#.. private void connection( string str)
{
string strcon = ConfigurationManager.ConnectionStrings["Pcon"].ToString();

SqlConnection con = new SqlConnection(strcon);


String select = txtComand.Text.ToString();


SqlCommand cmd = new SqlCommand(select, con);
SqlDataAdapter adp = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
adp.Fill(dt);
GridView1.DataSource = dt;
GridView1.DataBind();


}
protected void run_save(object sender, EventArgs e)
{

string s;

if (button1WasClicked)
{

connection(s);
}
else
{
label1.Text = "invalid value";

}
}
protected void btnPayrol_Click(object sender, EventArgs e)
{
button1WasClicked = true;
}

protected void btnSale_Click(object sender, EventArgs e)
{
button1WasClicked = true;
}

protected void btnsaleE_Click(object sender, EventArgs e)
{

}

protected void btnFinace_Click(object sender, EventArgs e)
{

}
master..
<td><asp:Button id="btnPayrol" runat="server" Text="Payrol"
onclick="btnPayrol_Click" />
</td>
<td><asp:Button id="btnSale" runat="server" Text="Sale"
OnClientClick="window.open('Sale.aspx','Sale.aspx');" onclick="btnSale_Click" /></td>
<td><asp:Button id="btnsaleE" runat="server" Text="ExportSale"
OnClientClick="window.open('SalesE.aspx','SalesE.aspx');"
onclick="btnsaleE_Click" /></td>
<td><asp:Button id="btnFinace" runat="server" Text="Finace" OnClientClick="window.open('Finace.aspx','Finace.aspx');"/></td>
</tr>
<tr><td>
<asp:TextBox runat="server" ID="txtComand" TextMode="MultiLine" Height="227px"
Width="352px"></asp:TextBox>
</td>
<td>
</td>
</tr>

</table>




<asp:Button runat="server" ID="idRun" OnClick="run_save" Text="RUN" />
<asp:GridView ID="GridView1" runat="server" CellPadding="4" ForeColor="#333333"
GridLines="None">
<RowStyle BackColor="#F7F6F3" ForeColor="#333333" />
<FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
<SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
<HeaderStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#999999" />
<AlternatingRowStyle BackColor="White" ForeColor="#284775" />
</asp:GridView>
webconfig...<connectionStrings>
<add name="Pcon" connectionString="data source= ITSW2;user id=sa;password=sqliil; initial catalog=payroll;"/>
<add name="Fcon" connectionString="data source= ITSW2;user id=sa;password=sqliil; initial catalog=Finance;"/>
<add name="Vcon" connectionString="data source= ITSW2;user id=sa;password=sqliil; initial catalog=sample;"/>
<add name="Econ" connectionString="data source= ITSW2;user id=sa;password=sqliil; initial catalog=Export_Billing;"/>
</connectionStrings