Datarelation problem : system.data.invalidconstraintexception: 'parent columns and child columns don't have type-matching columns.'

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C#7.0

Hi,

I am a beginner in C# and just tried to make a 1-N form relation with Binding.
2 tables : Teams & Spelers
I want to make a datarelation between spelerTeamID and TeamID but i get an error

System.Data.InvalidConstraintException: 'Parent Columns and Child Columns don't have type-matching columns.'

Hereby my code as i don't understand why this error is coming (both are Int32 as a datatype...
Any help more then welcome.

public partial class frmRugby : Form
    {
        public DataSet dsRugby = new DataSet("Rugby");
        public BindingSource masterBindingSourceRugbyTeam = new BindingSource();
        public BindingSource detailBindingSourceSpelers = new BindingSource();

        private DataTable CreateDataTableRugbyTeams()
        {
            DataTable dtTeams = new DataTable("Teams");
            DataColumn dcTID = new DataColumn("TeamID")
            {
            DataType= typeof(Int32),
            AllowDBNull = false,
            AutoIncrement = true,
            AutoIncrementSeed = 1,
            };
            DataColumn dcTeamNaam = new DataColumn("Teamnaam", typeof(string));
            DataColumn dcTrainer = new DataColumn("Trainer", typeof(string));
            DataColumn dcKlasse = new DataColumn("Klasse", typeof(string));
            DataColumn dcSoortRugby = new DataColumn("Soortrugby", typeof(string));
            DataColumn dcAantalSpelers = new DataColumn("Aantalspelers", typeof(string));
            dtTeams.Columns.Add("TeamID");
            dtTeams.Columns.Add("Teamnaam");
            dtTeams.Columns.Add("Trainer");
            dtTeams.Columns.Add("Klasse");
            dtTeams.Columns.Add("Soortrugby");
            dtTeams.Columns.Add("Aantalspelers");
            dtTeams.PrimaryKey = new DataColumn[1];
            dtTeams.PrimaryKey.Append(dcTID);

            return dtTeams;
        }

        private DataTable CreateDataTableSpelers()
        {
            DataTable dtSpelers = new DataTable("Spelers");
            DataColumn dcSID = new DataColumn("SpelerID")
            {
                DataType= typeof(Int32),
                AllowDBNull = false,
                AutoIncrement = true,
                AutoIncrementStep = 1,
            };

            DataColumn dcRoepNaam = new DataColumn("Roepnaam", typeof(Int32));
            DataColumn dcVoorLetters = new DataColumn("Voorletters", typeof(string));
            DataColumn dcTussenVoegsels = new DataColumn("Tussenvoegsels", typeof(string));
            DataColumn dcAchterNaam = new DataColumn("Achternaam", typeof(string));
            DataColumn dcGeboorteDatum = new DataColumn("Geboortedatum", typeof(DateTime));
            DataColumn dcRugnummer = new DataColumn("Rugnummer", typeof(byte));
            DataColumn dcSpelerTeamID = new DataColumn("SpelerTeamID")
            {
                DataType = typeof(Int32),
                AllowDBNull = false,
                
            };

            dtSpelers.Columns.Add(dcSID);
            dtSpelers.Columns.Add(dcVoorLetters);
            dtSpelers.Columns.Add(dcRoepNaam);
            dtSpelers.Columns.Add(dcTussenVoegsels);
            dtSpelers.Columns.Add(dcAchterNaam);
            dtSpelers.Columns.Add(dcGeboorteDatum);
            dtSpelers.Columns.Add(dcRugnummer);
            dtSpelers.Columns.Add(dcSpelerTeamID);
            dtSpelers.PrimaryKey.Append(dcSID);
            
         
            return dtSpelers;
        }
         public void CreateDataRelation()
        {
            DataColumn dcParent, dcChild;
            dcParent = dsRugby.Tables["Teams"].Columns["TeamID"];
            dcChild = dsRugby.Tables["Spelers"].Columns["SpelerTeamID"];
            DataRelation drTeamSpeler = new DataRelation("relationTeamSpeler",  dcParent, dcChild);
         dsRugby.Relations.Add(drTeamSpeler);
            ForeignKeyConstraint fkTeamSpeler = drTeamSpeler.ChildKeyConstraint;
            fkTeamSpeler.DeleteRule = Rule.None;
            fkTeamSpeler.UpdateRule = Rule.Cascade;


        }
        public frmRugby()
        {
            InitializeComponent();
            dsRugby.Tables.Add(CreateDataTableRugbyTeams());
            dsRugby.Tables.Add(CreateDataTableSpelers());
            CreateDataRelation();
            masterBindingSourceRugbyTeam.DataSource = dsRugby.Tables["RugbyTeams"];
            TxbTeamNaam.DataBindings.Add("Text", masterBindingSourceRugbyTeam, "Teamnaam");
            txbTrainer.DataBindings.Add("Text", masterBindingSourceRugbyTeam, "Trainer");
            lblTeamID.DataBindings.Add("Text", masterBindingSourceRugbyTeam, "TeamID");
            cmbKlasse.DataBindings.Add("Text", masterBindingSourceRugbyTeam, "Klasse");
            cmbSoortRugby.DataBindings.Add("Text", masterBindingSourceRugbyTeam, "Soort Rugby");
            detailBindingSourceSpelers.DataSource = masterBindingSourceRugbyTeam;
            detailBindingSourceSpelers.DataMember = "relationTeamSpeler";
            dgvGrid.DataSource = detailBindingSourceSpelers;



            
        }

What I have tried:

Tried to make a datarelation

DataColumn dcParent, dcChild;
            dcParent = dsRugby.Tables["Teams"].Columns["TeamID"];
            dcChild = dsRugby.Tables["Spelers"].Columns["SpelerTeamID"];
            DataRelation drTeamSpeler = new DataRelation("relationTeamSpeler",  dcParent, dcChild);

but I always get the error that columns should be of the same type but they are..