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Graph Issue

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Chart

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Aditya asked on 28 Jun 2011, 01:59 PM

I am select the coln from dropdownlist to set x-axies & y-axies .I store Collection of xAxies & YAxies values are store in

ObservableCollection . ObservableCollection contains the values count but not set to graph.souce

and given an error Object is not set to Instance of object.

Code is:----

ObservableCollection<GraphData> graphDataColl = new ObservableCollection<GraphData>();

graphDataColl.Clear();

string xAxisValue = string.Empty;

string yAxisValue = string.Empty;

if ((xAxies.SelectedItem != null) && (yAxies.SelectedItem != null))

{

xAxisValue = xAxies.SelectedItem.ToString();

yAxisValue = yAxies.SelectedItem.ToString();

if ((xAxisValue != null) && (yAxisValue != null))

{

DataTable dt = (DataTable)radGrV.ItemsSource;

if (this.chart.Series != null && this.chart.Series.Any())

{

foreach (var row in dt.Rows)

{

graphDataColl.Add(

new GraphData

{

XAxis =

Convert.ToInt32(row[xAxisValue]),

YAxis =

Convert.ToInt32(row[yAxisValue])

});

}

var currentChart = (this.chart.Series[0] as System.Windows.Controls.DataVisualization.Charting.ColumnSeries);

currentChart.DependentValuePath = xAxisValue;

currentChart.IndependentValuePath = yAxisValue;

currentChart.ItemsSource = graphDataColl;

}

}

and xmal code is

<toolkit:Chart x:Name="chart" Grid.Row="2" HorizontalAlignment="Stretch" HorizontalContentAlignment="Stretch" VerticalAlignment="Top" Margin="0,0,0,0" MinWidth="300" MinHeight="500" >

<toolkit:Chart.Series >

<toolkit:ColumnSeries/>

</toolkit:Chart.Series>

</toolkit:Chart>

What's going wrong.....