Visual C# - Redirect Users to Different windows forms according to their User Role

Question

I want to create a Login form which redirects the user login to the two different form according to the roles of users. I have two forms 1. UserPanelFrm and 2.FrmUserRole and two user role . 1. Admin and 2.User . I want to redirect Admin to UserPanelFrm and User to form FrmUserRole. I researched for this process but only could found useful resources for ASP.NET.

tbl_Staff:

CREATE TABLE [dbo].[tbl_Staff](
[StaffID] [int] IDENTITY(1,1) NOT NULL,
[Name] [nvarchar](100) NOT NULL,
[Address] [nvarchar](500) NULL,
[Phone] [nvarchar](100) NULL,
[Email] [nvarchar](100) NULL,
[JoinedDate] [date] NULL,
[Username] [nvarchar](50) NULL,
[Password] [nvarchar](max) NULL,
[CreatedDate] [date] NULL,
[Roles] [nvarchar](200) NULL,
[Status] [int] NULL
}

tbl_StaffRoles:

CREATE TABLE [dbo].[tbl_StaffRoles](
[id] [int] NULL,
[RoleDescription] [nvarchar](50) NULL
)

tbl_StaffRoles data:

id RoleDescription
1 Admin
2 User

Hi, I am currently using following code for normal login.

LoginForm btnLogin :

private void btnLogin_Click(object sender, EventArgs e)
{
    try
    {
        int result = uc.Login(txtUserName.Text, txtPassword.Text);
        if (result == 1)
        {
            this.Hide();
            UserPanelFrm frm = new UserPanelFrm();
            frm.ShowDialog();
            this.Close();
        }
        else
        {
            MessageBox.Show("INVALID USERNAME OR PASSWORD");
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

UserClass.cs Login class:

public int Login(String Username, String Password)
{
    try
    {
        int result = 0;
        SqlCommand cmd = new SqlCommand("Select * from tbl_Staff where Username=@Username and Password=@Password", conn);
        cmd.Parameters.AddWithValue("@Username", Username);
        cmd.Parameters.AddWithValue("@Password", Password);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        DataTable dt = new DataTable();
        dt.Load(dr);
        conn.Close();
        if (dt.Rows.Count > 0)
            result = 1;
        else
            result = 0;

        return result;
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

Please help to modify the code so i can redirect users to windows form according to their roles.

Answer 1

Modify the Login method to return the datatable instead (assuming you have a column for the role in that query):

private void btnLogin_Click(object sender, EventArgs e)
{
    try
    {
        DataTable result = uc.Login(txtUserName.Text, txtPassword.Text);
        if (result.Rows.Count == 1)
        {
            this.Hide();

            string role = result.Rows[0]["Role"].ToString();


            switch (role)
            {
                case "User": 
                    UserPanelFrm frm = new UserPanelFrm();
                    frm.ShowDialog();
                    this.Close();
                    break;
                case "Admin":
                    //Show a different form
                    FrmUserRole fur = new FrmUserRole();
                    fur.ShowDialog();
                    this.Close();
                    break;
            }
        }
        else
        {
        MessageBox.Show("INVALID USERNAME OR PASSWORD");
        }
    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

and...

public DataTable Login(String Username, String Password)
{
    try
    {
        SqlCommand cmd = new SqlCommand("Select * from tbl_Staff where Username=@Username and Password=@Password", conn);
        cmd.Parameters.AddWithValue("@Username", Username);
        cmd.Parameters.AddWithValue("@Password", Password);
        conn.Open();
        SqlDataReader dr = cmd.ExecuteReader();
        DataTable dt = new DataTable();
        dt.Load(dr);
        conn.Close();
        return dt;
    }
    catch (Exception ex)
    {
        throw ex;
    }
}