SSIS script component buffer is not getting cleared for next file

Question

I have very simple SSIS package which is using a Data flow inside foreachloop container to read multiple files together. The files are very simple which is having ID and Name as 2 columns. I am having 4 files only the data is different in each file( Id is different). Now I used flat file source then script component and 2 flat file destinations.
script component code is given below'

#region Help:  Introduction to the Script Component

#endregion

#region Namespaces
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;
#endregion

/// <summary>
/// This is the class to which to add your code.  Do not change the name, attributes, or parent
/// of this class.
/// </summary>
[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
public class ScriptMain : UserComponent
{
    #region Help:  Using Integration Services variables and parameters
    /* To use a variable in this script, first ensure that the variable has been added to
     * either the list contained in the ReadOnlyVariables property or the list contained in
     * the ReadWriteVariables property of this script component, according to whether or not your
     * code needs to write into the variable.  To do so, save this script, close this instance of
     * Visual Studio, and update the ReadOnlyVariables and ReadWriteVariables properties in the
     * Script Transformation Editor window.
     * To use a parameter in this script, follow the same steps. Parameters are always read-only.
     *
     * Example of reading from a variable or parameter:
     *  DateTime startTime = Variables.MyStartTime;
     *
     * Example of writing to a variable:
     *  Variables.myStringVariable = "new value";
     */
    #endregion

    #region Help:  Using Integration Services Connnection Managers
    /* Some types of connection managers can be used in this script component.  See the help topic
     * "Working with Connection Managers Programatically" for details.
     *
     * To use a connection manager in this script, first ensure that the connection manager has
     * been added to either the list of connection managers on the Connection Managers page of the
     * script component editor.  To add the connection manager, save this script, close this instance of
     * Visual Studio, and add the Connection Manager to the list.
     *
     * If the component needs to hold a connection open while processing rows, override the
     * AcquireConnections and ReleaseConnections methods.
     * 
     * Example of using an ADO.Net connection manager to acquire a SqlConnection:
     *  object rawConnection = Connections.SalesDB.AcquireConnection(transaction);
     *  SqlConnection salesDBConn = (SqlConnection)rawConnection;
     *
     * Example of using a File connection manager to acquire a file path:
     *  object rawConnection = Connections.Prices_zip.AcquireConnection(transaction);
     *  string filePath = (string)rawConnection;
     *
     * Example of releasing a connection manager:
     *  Connections.SalesDB.ReleaseConnection(rawConnection);
     */
    #endregion

    #region Help:  Firing Integration Services Events
    /* This script component can fire events.
     *
     * Example of firing an error event:
     *  ComponentMetaData.FireError(10, "Process Values", "Bad value", "", 0, out cancel);
     *
     * Example of firing an information event:
     *  ComponentMetaData.FireInformation(10, "Process Values", "Processing has started", "", 0, fireAgain);
     *
     * Example of firing a warning event:
     *  ComponentMetaData.FireWarning(10, "Process Values", "No rows were received", "", 0);
     */
    #endregion
    static string condition = string.Empty;
    /// <summary>
    /// This method is called once, before rows begin to be processed in the data flow.
    ///
    /// You can remove this method if you don't need to do anything here.
    /// </summary>
    public override void PreExecute()
    {
        base.PreExecute();
        /*
         * Add your code here
         */
    }

    /// <summary>
    /// This method is called after all the rows have passed through this component.
    ///
    /// You can delete this method if you don't need to do anything here.
    /// </summary>
    public override void PostExecute()
    {
        base.PostExecute();
        /*
         * Add your code here
         */
    }

    /// <summary>
    /// This method is called once for every row that passes through the component from Input0.
    ///
    /// Example of reading a value from a column in the the row:
    ///  string zipCode = Row.ZipCode
    ///
    /// Example of writing a value to a column in the row:
    ///  Row.ZipCode = zipCode
    /// </summary>
    /// <param name="Row">The row that is currently passing through the component</param>
    public override void Input0_ProcessInputRow(Input0Buffer Row)
    {
        try
        {
            if (Row.ID == "4")
            {
                condition = Row.ID;
            }

            Output0Buffer.AddRow();
            Output0Buffer.RowData = Row.ID + "|" + Row.Name;
        }
        catch (Exception ex)
        {
            bool cancel = true;  // set to true to cause execution to abort 
            ComponentMetaData.FireError(-1, "Input0_ProcessInputRow()", ex.Message, "", -1, out cancel);// raise the error event to SSIS
            throw ex;
        }
    }

    public override void Input0_ProcessInput(Input0Buffer Row)
    {
        try
        {
            base.Input0_ProcessInput(Row);

            //Will be true this time
            if (Row.EndOfRowset())
            {
                if (condition == "4")
                {
                    var data = condition;
                    AOBJOutputBuffer.AddRow();
                    AOBJOutputBuffer.RowData = data;
                }
            }
        }
        catch (Exception ex)
        {
            bool cancel = true;  // set to true to cause execution to abort 
            ComponentMetaData.FireError(-1, "Input0_ProcessInputRow()", ex.Message, "", -1, out cancel);// raise the error event to SSIS
            throw ex;
        }
    }
}

What is happening is that after writing data in first file, it writes same data in next 3 files. which means that buffer is somehow not getting cleared. The IDs in all 4 input files are different and no Id is repeated in any file. The output buffer has only one column RowData which is of string type

Please help me to understand this little bit.