how to change the chart type with reportViewer in VS2010

hi, i want to change the chart type of the chart in a rdlc file with the reportViewer using
vs2010 ,i thought it's important to find the ChartType node in the rdlc xml file ,but there is no the nodes that can represent the chartType property. so i have no idea now ,Can you
have any solution ?

this effect is lie that

code snippet

/// Replaces the chart type in the report with the chart type passed to this method.

/// </summary>

/// <param name="documentToUpdate">The report.rdlc (xml document) you want to change the chart type for.</param>

/// <param name="desiredChartType">The desired chart type, don't worry about blank strings, it is set to a default in the function.</param>

/// <param name="reportNamespace">The namespace of the report. You can find this by opening your .rdlc file in an xml browser.</param>

/// <param name="listName">The name of the list object that you included in your report. If your components are not using a list, pass null.</param>

/// <param name="chartName">The name of the chart you want to adjust the type for.</param>

/// <param name="viewerToUpdate">The ReportViewer object you are going to add this report to.</param>

public void UpdateReportChartType(XmlDocument documentToUpdate, string desiredChartType, string reportNamespace, string listName, string chartName,

ReportViewer viewerToUpdate,DataTable dt)
{

XmlElement root = documentToUpdate.DocumentElement;

XmlNamespaceManager nsManager = new XmlNamespaceManager(documentToUpdate.NameTable);

nsManager.AddNamespace("ns", reportNamespace);

XmlNode workingNode;

//If component does not use a list, leave out the list item by making the list string blank.

string listToUse;

if ((listName == null) || (listName == ""))

listToUse = "";

else

listToUse = "ns:ReportItems/ns:List[@Name='" + listName + "']/";

//Set the chart type.

workingNode = root.SelectSingleNode("ns:Body/" + listToUse + "ns:ReportItems/ns:Chart[@Name='" + chartName + "']/ns:Type", nsManager);

//this code is making error //because the type node was never found ;

if (desiredChartType == "")

workingNode.InnerText = "Column";

else

workingNode.InnerText = desiredChartType;

//Save original settings to restore after resetting.

ProcessingMode originalProcessingMode = viewerToUpdate.ProcessingMode;

ReportDataSource originalDataSource = new ReportDataSource("UserPages_Data", dt);

//Reset the basic report information.

viewerToUpdate.Reset();

viewerToUpdate.ProcessingMode = originalProcessingMode;

viewerToUpdate.LocalReport.DataSources.Add(originalDataSource);

viewerToUpdate.LocalReport.ReportPath = string.Empty;

viewerToUpdate.LocalReport.LoadReportDefinition(new StringReader(documentToUpdate.OuterXml));

viewerToUpdate.LocalReport.Refresh();
}

if it is possible ,please connect me ,that's very hurry .

thanks

how to change the chart type with reportViewer in VS2010

how to change the chart type with reportViewer in VS2010

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