how to store data from .txt to table

By default, the Flat File connection manager sets the length of string columns to 50 characters. In the Flat File Connection Manager Editor dialog box, you can evaluate sample data and automatically resize the length of these columns to prevent truncation of data or excess column width. Also, unless you subsequently resize the column length in a Flat File source or a transformation, the column length of string column remains the same throughout the data flow. If these string columns map to destination columns that are narrower, warnings appear in the user interface. Moreover, at run time, errors may occur due to data truncation. To avoid errors or truncation, you can resize the columns to be compatible with the destination columns in the Flat File connection manager, the Flat File source, or a transformation. To modify the length of output columns, you set the Length property of the output column on the Input and Output Properties tab in the Advanced Editor dialog box.

If you update column lengths in the Flat File connection manager after you have added and configured the Flat File source that uses the connection manager, you do not have to manually resize the output columns in the Flat File source. When you open the Flat File Source dialog box, the Flat File source provides an option to synchronize the column metadata.
ref:
http://msdn.microsoft.com/en-us/library/ms140266.aspx[^]

If you are not comfortable with it you can create your own text file reader with Script component: follow: http://msdn.microsoft.com/en-us/library/ms136060.aspx[^]

using System.IO;
public class ScriptMain:
    UserComponent

{
    private StreamReader textReader;
    private string exportedAddressFile;

    public override void AcquireConnections(object Transaction)
    {

        IDTSConnectionManager100 connMgr = this.Connections.MyFlatFileSrcConnectionManager;
        exportedAddressFile = (string)connMgr.AcquireConnection(null);

    }

    public override void PreExecute()
    {
        base.PreExecute();
        textReader = new StreamReader(exportedAddressFile);
    }

    public override void CreateNewOutputRows()
    {

        string nextLine;
        string[] columns;

        char[] delimiters;
        delimiters = ",".ToCharArray();

        nextLine = textReader.ReadLine();
        while (nextLine != null)
        {
            columns = nextLine.Split(delimiters);
            {
                MyAddressOutputBuffer.AddRow();
                MyAddressOutputBuffer.AddressID = columns[0];
                MyAddressOutputBuffer.City = columns[3];
            }
            nextLine = textReader.ReadLine();
        }

    }

    public override void PostExecute()
    {

        base.PostExecute();
        textReader.Close();

    }

}