Stored Procedure with multiple inserts SQL and ASP.Net

Question

I'm new to writing stored procedures. I want to write a stored procedure in SQL Server for multiple inserts from a table in ASP.net.

This is what I have so far:

Stored procedure:

ALTER procedure [dbo].[spUser]
    @userName VARCHAR(50),
    @membershipnr INT,
    @email VARCHAR(50)
as
begin
    DECLARE @returnvalue INT

    IF (SELECT COUNT(*) FROM User WHERE Membershipnr = @membershipnr) > 0
    BEGIN
        SET @returnvalue = -1
    END
    ELSE
    BEGIN
        SET @returnvalue = 1

        INSERT INTO User(Name, Membershipnr, Email) 
        VALUES(@userName, @membershipnr, @email)
    END

    SELECT @returnvalue
end

C# code:

SqlCommand cmd = new SqlCommand("spUser", conn);
cmd.CommandType = CommandType.StoredProcedure;

SqlCommand com = new SqlCommand("spTeam", conn);
com.CommandType = CommandType.StoredProcedure;

if (ddl1.SelectedValue == "2" && rb.SelectedValue == "M" && ddl2.SelectedValue == "1")
{
    cmd.Parameters.AddWithValue("@userName", txtName.Text);
    cmd.Parameters.AddWithValue("@userName", txtName2.Text);
    cmd.Parameters.AddWithValue("@membershipnr", txtMembershipnr.Text);
    cmd.Parameters.AddWithValue("@membershipnr", txtMembershipnr2.Text);
    cmd.Parameters.AddWithValue("@email", txtEmail.Text);
    cmd.Parameters.AddWithValue("@email", txtEmail2.Text);
    com.Parameters.AddWithValue("@clubID", "1");
    com.Parameters.AddWithValue("@class", "2xM");
    com.Parameters.AddWithValue("@teamName", txtTeam.Text);

    conn.Open();
    int answer = (int)cmd.ExecuteNonQuery();

}

I get an error when I try to insert 2 columns. The error I get is:

Procedure or function spUser HAS too many arguments specified.

I think the problem is my stored procedure. But I don't know how I can specify more inserts in the procedure. I searched the internet but I couldn't find the answer.

Does somebody know how I can fix this so the error goes away and my insert will work?

Thanks in advance!

UPDATE:

I'm using a 3 table with the texboxes.

One of the tables:

<asp:Table ID="tblTwo" runat="server" class="table">
    <asp:TableHeaderRow>
        <asp:TableHeaderCell>Name</asp:TableHeaderCell>
        <asp:TableHeaderCell>Email</asp:TableHeaderCell>
        <asp:TableHeaderCell>Membershipnr</asp:TableHeaderCell>
    </asp:TableHeaderRow>

    <asp:TableRow>
        <asp:TableCell>
            <asp:TextBox ID="txtName" type="text" class="form-control" runat="server"></asp:TextBox>
        </asp:TableCell>
        <asp:TableCell>
            <asp:TextBox ID="txtEmail" type="text" class="form-control" runat="server"></asp:TextBox>
        </asp:TableCell>
        <asp:TableCell>
            <asp:TextBox ID="txtMembershipnr" type="text" class="form-control" runat="server"></asp:TextBox>
        </asp:TableCell>
    </asp:TableRow>
    <asp:TableRow>
        <asp:TableCell>
            <asp:TextBox ID="txtName2" type="text" class="form-control" runat="server"></asp:TextBox>
        </asp:TableCell>
        <asp:TableCell>
            <asp:TextBox ID="txtEmail2" type="text" class="form-control" runat="server"></asp:TextBox>
        </asp:TableCell>
        <asp:TableCell>
            <asp:TextBox ID="txtMembershipnr2" type="text" class="form-control" runat="server"></asp:TextBox>
        </asp:TableCell>
    </asp:TableRow>
</asp:Table>

Also I have a second stored procedure for CulbID , Class and Team because this has to be filled into another SQL Server table.

Code of that stored procedure:

ALTER procedure [dbo].[spTeam]
    @teamName VARCHAR (50)
as
BEGIN
    INSERT INTO Ploeg(Name, RegistrationDate)
    VALUES(@teamName, GETDATE())
END

Answer 1

Your stored procedure has less number of input variables then what you are sending from your C# code. You need to define them in your stored procedure.

Try to add all the input variables which you are sending from your code like this:

ALTER procedure [dbo].[spUser]
@userName VARCHAR(50),
@membershipnr INT,
@email VARCHAR(50)
@clubID int,
@class varchar(5),
@teamname varchar(15),
.............

Answer 2

Like others have mentioned, you've got too many parameters in you C# code. Your Stored Procedure takes only 3 parameters

@userName VARCHAR(50),
@membershipnr INT,
@email VARCHAR(50)

As such, when you are adding the parameters in C#, they need to match (the number of parameters, name and type) ie

 cmd.Parameters.AddWithValue("@userName", txtName.Text); cmd.Parameters.AddWithValue("@membershipnr", txtMembershipnr.Text); cmd.Parameters.AddWithValue("@email", txtEmail.Text); 

Personally, I like to pass the type as well using the following

 cmd.Parameters.Add("userName", SqlDbType.VarChar).Value = txtName.Text; cmd.Parameters.Add("membershipnr", SqlDbType.Int).Value = txtMembershipnr.Text; cmd.Parameters.Add("email", SqlDbType.VarChar).Value = txtEmail.Text; 

Answer 3

You're specifying too many parameters in your code (some missing, some duplicated). The way you've written the procedure would require the stored proc to be executed once for each row of data you want to insert.

Usually this would be achieved with a loop in your C#.