Additional information: Object reference not set to an instance of an object.

[michael walser]

I get this message in "Spaltenbre ite definieren" => Definition for Columns
Width

An unhandled exception of type 'System.NullRef erenceException ' occurred in
WindowsApplicat ion1.exe

Additional information: Object reference not set to an instance of an
object.

Please help me.

Thanks

Michael

CODE:
=====
private void CreateMyDatagri d()

{

// MyDatagrid erstellen

DataGrid MyDataGrid = new DataGrid();

MyDataGrid.Boun ds = new Rectangle(new Point(10,10), new Size(650,350));

// Datagrid Eigenschaften

MyDataGrid.Capt ionText="Berech tigung -> ALLE = A+B+E+L / A=Ansehen /
B=Bearbeiten / E = Erstellen / L=Löschen";

MyDataGrid.Read Only = false;

// Dataset erstellen

DataSet MyDataSet = new DataSet();
DataGridTableSt yle myTableStyle = new DataGridTableSt yle();

myTableStyle.Ma ppingName = "MappingName_ts _berechtigung"; // ts=tablestyle

DataGridBoolCol umn boolCol = new DataGridBoolCol umn();

boolCol.Mapping Name="MappingNa me_dgbc_berecht igung";
//dgbc=datagridbo olcolumn

((DataGridBoolC olumn)boolCol). AllowNull = false;

myTableStyle.Gr idColumnStyles. Add(boolCol);

//MyDataGrid.Tabl eStyles.Clear() ;

// DataTable erstellen

DataTable dt = new DataTable("Data Table_Berechtig ung");
// Spalten erstellen

dt.Columns.Add( "Modul", typeof(string)) .ReadOnly = true;

dt.Columns.Add( "Zusatz..." , typeof(string)) .ReadOnly = true;

dt.Columns.Add( "ALLE", typeof(bool));

dt.Columns.Add( "A", typeof(bool));

dt.Columns.Add( "B", typeof(bool));

dt.Columns.Add( "E", typeof(bool));

dt.Columns.Add( "L", typeof(bool));

//Spaltenbreite definieren

myTableStyle.Gr idColumnStyles["Modul"].Width=20;

myTableStyle.Gr idColumnStyles["Zusatz..."].Width=50;

myTableStyle.Gr idColumnStyles["ALLE"].Width=60;

//MyDataGrid.Tabl eStyles["DataTable_Bere chtigung"].GridColumnStyl es[0].Width
=0;

//MyDataGrid.Tabl eStyles["DataTable_Bere chtigung"].GridColumnStyl es[1].Width
=80;

//MyDataGrid.Tabl eStyles["DataTable_Bere chtigung"].GridColumnStyl es[2].Width
=80;

//MyDataGrid.Tabl eStyles["DataTable_Bere chtigung"].GridColumnStyl es[3].Width
=20;

// Zeilen erstellen und inhalt abfüllen

// checkbox in variable

int test = 1;

dt.Rows.Add(new Object[] {"Adresse", "ev. sonst noch was",0,test,0,0 ,0});

dt.Rows.Add(new Object[] {"Depositen" , "ev. sonst noch was",1,1,1,1,1} );

dt.Rows.Add(new Object[] {"Obligation ", "ev. sonst noch was",0,0,0,0,0} );

dt.Rows.Add(new Object[] {"Miete", "ev. sonst noch was",1,1,1,1,1} );

dt.Rows.Add(new Object[] {"Stammdaten ", "ev. sonst noch was",0,0,0,0,0} );

// DataTable in dataset

MyDataSet.Table s.Add(dt);
// Dataset in datagrid

MyDataGrid.SetD ataBinding(MyDa taSet,"DataTabl e_Berechtigung" );

// Tablestyle dem Datagrid hinzufügen

MyDataGrid.Tabl eStyles.Add(myT ableStyle);
// Anzeigen des Datagrids

this.Controls.A dd(MyDataGrid);

}

[Frans Bouma [C# MVP]]

"michael walser" <mi************ @bingo.de> wrote in
news:eZ******** *****@TK2MSFTNG P12.phx.gbl:

I get this message in "Spaltenbre ite definieren" => Definition for
Columns Width

An unhandled exception of type 'System.NullRef erenceException ' occurred
in WindowsApplicat ion1.exe

Additional information: Object reference not set to an instance of an
object.

Please help me.
// Spalten erstellen

dt.Columns.Add( "Modul", typeof(string)) .ReadOnly = true;
dt.Columns.Add( "Zusatz..." , typeof(string)) .ReadOnly = true;
dt.Columns.Add( "ALLE", typeof(bool)); .... //Spaltenbreite definieren

myTableStyle.Gr idColumnStyles["Modul"].Width=20;
myTableStyle.Gr idColumnStyles["Zusatz..."].Width=50;
myTableStyle.Gr idColumnStyles["ALLE"].Width=60;

In the debugger, could you please check if these column styles are
actually defined? You probably should add a new GridColumnStyle first.

Frans.

--
Get LLBLGen Pro, the new O/R mapper for .NET: http://www.llblgen.com
My .NET Blog: http://weblogs.asp.net/fbouma
Microsoft C# MVP

[Anton Tupy]

Frans Bouma [C# MVP] wrote:

"michael walser" <mi************ @bingo.de> wrote in
news:eZ******** *****@TK2MSFTNG P12.phx.gbl:

I get this message in "Spaltenbre ite definieren" => Definition for
Columns Width

An unhandled exception of type 'System.NullRef erenceException ' occurred
in WindowsApplicat ion1.exe

Additional information: Object reference not set to an instance of an
object.

Please help me.
// Spalten erstellen

dt.Columns.Ad d("Modul", typeof(string)) .ReadOnly = true;
dt.Columns.Ad d("Zusatz..." , typeof(string)) .ReadOnly = true;
dt.Columns.Ad d("ALLE", typeof(bool));

...

//Spaltenbreite definieren

myTableStyle. GridColumnStyle s["Modul"].Width=20;
myTableStyle. GridColumnStyle s["Zusatz..."].Width=50;
myTableStyle. GridColumnStyle s["ALLE"].Width=60;

In the debugger, could you please check if these column styles are
actually defined? You probably should add a new GridColumnStyle first.

Frans.

Yes? that's right. I met with this error many time.

[Anton Tupy]

Frans Bouma [C# MVP] wrote:

"michael walser" <mi************ @bingo.de> wrote in
news:eZ******** *****@TK2MSFTNG P12.phx.gbl:

I get this message in "Spaltenbre ite definieren" => Definition for
Columns Width

An unhandled exception of type 'System.NullRef erenceException ' occurred
in WindowsApplicat ion1.exe

Additional information: Object reference not set to an instance of an
object.

Please help me.
// Spalten erstellen

dt.Columns.Ad d("Modul", typeof(string)) .ReadOnly = true;
dt.Columns.Ad d("Zusatz..." , typeof(string)) .ReadOnly = true;
dt.Columns.Ad d("ALLE", typeof(bool));

...

//Spaltenbreite definieren

myTableStyle. GridColumnStyle s["Modul"].Width=20;
myTableStyle. GridColumnStyle s["Zusatz..."].Width=50;
myTableStyle. GridColumnStyle s["ALLE"].Width=60;

In the debugger, could you please check if these column styles are
actually defined? You probably should add a new GridColumnStyle first.

Frans.

Yes, that's right. I met with this error many time.

[michael walser]

Yes it works.

// Tablestyle erstellen

DataGridTableSt yle myTableStyle = new DataGridTableSt yle();

myTableStyle.Ma ppingName = "DataTable_Bere chtigung";

MyDataGrid.Tabl eStyles.Clear() ;
// Spalten-Eigenschaften

DataGridTextBox Column Col_0 = new DataGridTextBox Column();

Col_0.MappingNa me="Modul";

Col_0.Width = 150;

Col_0.ReadOnly = true;

Col_0.HeaderTex t = "Module";

DataGridBoolCol umn Col_1 = new DataGridBoolCol umn();

Col_1.MappingNa me="ALLE";

Col_1.Width = 60;

Col_1.AllowNull = false;

Col_1.HeaderTex t = "ALLE";

Col_1.Alignment = System.Windows. Forms.Horizonta lAlignment.Cent er;

DataGridBoolCol umn Col_2 = new DataGridBoolCol umn();

......etc etc..

Thanks for your help

Michael