How to call node directly from a node list and overwrite the inner text without looping from node list using C#?

<?xml version="1.0"?>

<DTSConfiguration>


<DTSConfigurationHeading>

<DTSConfigurationFileInfo GeneratedDate="06/04/2018 11:06:33" GeneratedFromPackageID="{5A776659-3F33-4F34-A91A-D4BC80548271}" GeneratedFromPackageName="Package" GeneratedBy="CHN\Hasna.EK"/>

</DTSConfigurationHeading>


<Configuration ValueType="Boolean" Path="\Package.Connections[Flat File Connection Manager].Properties[AlwaysCheckForRowDelimiters]" ConfiguredType="Property">

<ConfiguredValue>-1</ConfiguredValue>

</Configuration>


-<Configuration ValueType="Int32" Path="\Package.Connections[Flat File Connection Manager].Properties[CodePage]" ConfiguredType="Property">

<ConfiguredValue>1252</ConfiguredValue>

</Configuration>


-<Configuration ValueType="Boolean" Path="\Package.Connections[Flat File Connection Manager].Properties[ColumnNamesInFirstDataRow]" ConfiguredType="Property">

<ConfiguredValue>-1</ConfiguredValue>

</Configuration>


-<Configuration ValueType="String" Path="\Package.Connections[Flat File Connection Manager].Properties[ConnectionString]" ConfiguredType="Property">

<ConfiguredValue>E:\SSIS\Test3\emp.txt</ConfiguredValue>

</Configuration>

</DTSConfiguration>

 string filename = "emp3.txt";

string dtConfigfilename = @"E:\SSIS\x.dtsConfig"; (Package Config File Configurable)
XmlDocument xmldoc = new XmlDocument();
xmldoc.Load(dtConfigfilename);
XmlNodeList nodeList = xmldoc.DocumentElement.ChildNodes;



foreach (XmlElement element in nodeList)
{
    if (element.Name == "Configuration")
    {
        if (element.Attributes["Path"].InnerText == "\\Package.Connections[Flat File Connection Manager].Properties[ConnectionString]")
        {
            element.ChildNodes[0].InnerText = @"E:\SSIS\Test2\" + filename; (Configurable file Store Folder)
            break;
        }
    }
}
xmldoc.Save(dtConfigfilename);