Stuck at a point in my project of Housing society

As a new member registers , I want the admin to verify their details and allot them with a username and password that should be send to the user through an email , so that the user can perform its various tasks....

Now The admin sees the data in a form of gridview and i want to have a button in the last coloumn of each row so that as soon as it is clicked , new user is declared accepted and an email is forwarded with a username and  and randomly generated password......So kindly help me with the implementation of this part as to how to make that button and perform its coding......
Sukesh ShuklaAsked:
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Najam UddinCommented:
Assuming you have id, name and email or user

<asp:GridView ID="GridView1" runat="server" DataKeyNames="id" DataSourceID="SqlDataSource1"
        <asp:BoundField DataField="name" HeaderText="Name" />
        <asp:BoundField DataField="email" HeaderText="Email" />
        <asp:TemplateField ShowHeader="False">
                <asp:Button ID="Button1" runat="server" CausesValidation="false"   CommandName="SendMail"
                    Text="Approve" CommandArgument='<%# Eval("id") %>' />

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In code behind
protected void GridView1_OnRowCommand(object sender, GridViewCommandEventArgs e)
    if (e.CommandName == "SendMail")
       int id = Convert.ToInt32(e.CommandArgument);
      // approve & send email

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