We can use the ASP.NET membership provider in WinForms
application using the following way.
1.     
Create ASP.NET membership database using
aspnet_regsql.exe which is location at Windows\Microsoft.NET\Framework\{.NET
version} directory.
2.     
Configure the app.config file as follows
<configuration>
<connectionStrings>
<add name="UserDbConnectionString" connectionString="FullConnectionString" providerName="System.Data.SqlClient"/>
  </connectionStrings>
  <system.web>
    <membership defaultProvider="AspNetSqlMembershipProvider">
      <providers>
        <remove name="AspNetSqlMembershipProvider"/>
        <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="UserDbConnectionString" enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" applicationName="/" requiresUniqueEmail="false" passwordFormat="Hashed" maxInvalidPasswordAttempts="5" minRequiredPasswordLength="7" minRequiredNonalphanumericCharacters="1" passwordAttemptWindow="10" passwordStrengthRegularExpression=""/>
      </providers>
    </membership>
    <roleManager enabled="true" defaultProvider="AspNetSqlRoleProvider" cacheRolesInCookie="true" createPersistentCookie="false" cookieProtection="All">
      <providers>
        <remove name="AspNetSqlRoleProvider"/>
        <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" applicationName="AspNet" connectionStringName="UserDbConnectionString"/>
      </providers>
    </roleManager>
  </system.web>
</configuration> 
3.     
Add project references 
i)                
System.Security
ii)               
System.Web
iii)              
System.Web.ApplicationServices
4.     
Now you can use code like below
i.                
Create User
private void btnCreate_Click(object sender, EventArgs e)
        {
            try
            {
                MembershipUser user;
                user = Membership.CreateUser(txtUser.Text,
txtPass.Text);
                MessageBox.Show(txtUser.Text + "is created successfully");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
ii.               
Validate User
private void btnLogin_Click(object sender, EventArgs e)
        {
            try
            {
                if (Membership.ValidateUser(txtUser.Text,
txtPass.Text))
                {
                    var roles = Roles.GetRolesForUser(txtUser.Text);
                }
                else
                {
                    MessageBox.Show(txtUser.Text + " is failed to login.");
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }