change password in asp.net using Entity Framework

Question

Can someone help me...

 

how do I implement change password firstly it checks old password matches and then update new password in database in asp.net Using entity Framework..

 

below is my design code..

<div class="col-md-12 col-sm-12 col-xs-12 user-login-box">
<table class="style1">
<tr>
<td>Current Password:</td>
<td>
<asp:TextBox ID="TxtCrntPswd" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>New Password:</td>
<td>
<asp:TextBox ID="TxtNwPswd" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>Confirm New Password:</td>
<td>
<asp:TextBox ID="TxtCnPswd" runat="server"></asp:TextBox>
</td>
</tr>
</table>
</div>
<asp:Button ID="BtnPswd" runat="server" Text="Save" OnClick="BtnPswd_Click" />
<asp:Label ID="lbl_msg" Font-Bold="True" BackColor="#FFFF66" ForeColor="#FF3300" runat="server" Text=""></asp:Label><br /><br />
<asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/Profile.aspx">Login</asp:HyperLink>
</div>
</div>