How would I export a DataTable to a text file and define the string length and the start position of each column ?

My issue is I need to build a text file with a specific format. Each row (line) in the text file can only be 111 characters long and each row (line) in the text file will represent a single row from the DataTable.

DataTable:
Column1 | Column2 | Column3 | Column4
My            |Phone #   |is                |8000000000
My            |Phone #   |is                |9990000000


TextFile:

Column1 starts at position 0, Column2 starts at position 2, Column3 starts at position 40, Column4 starts at position 90,

MyPhone#                                is                                                8000000000          
MyPhone#                                is                                                9990000000          


I am able to use

public void ExportDataTabletoFile(DataTable datatable, string delimited, bool exportcolumnsheader, string file)

{
    StreamWriter str = new StreamWriter(file, false, System.Text.Encoding.Default);
    if (exportcolumnsheader)
    {
        string Columns = string.Empty;
        foreach (DataColumn column in datatable.Columns)
        {
            Columns += column.ColumnName + delimited;
        }
        str.WriteLine(Columns.Remove(Columns.Length - 1, 1));
    }
    foreach (DataRow datarow in datatable.Rows)
    {
        string row = string.Empty;
 
        foreach (object items in datarow.ItemArray)
        {
 
            row += items.ToString() + delimited;
        }
        str.WriteLine(row.Remove(row.Length - 1, 1));
 
    }
    str.Flush();
    str.Close();
 
}

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And call it like

ExportDataTabletoFile(GetTable(), " ,", false, file);

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but that is all I can come up with.

result:

My,Phone#,is,8000000000
My,Phone#,is,9990000000

Can any one expand on this for me.

Thanks.....