unable to get the Textbox data in bat file

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C#

in the below code am unable to retreive the TxtUsername.Text data in file. I dont know how to retrieve the textbox data in the line
the output should be like this:
c:
cd \
cd Program Files
cd VMware
cd VMware OVF Tool
start ovftool.exe --powerOffSource vi://izaz
But am getting the out put as:
c:
cd \
cd Program Files
cd VMware
cd VMware OVF Tool
start ovftool.exe --powerOffSource vi://

here is my code:

private void BtnCreate_Click(object sender, EventArgs e)
        {
          StreamWriter file = new StreamWriter("Export.bat");
          file.WriteLine("c: ");
          file.WriteLine("cd \\");
          file.Write("cd Program Files " + Environment.NewLine);
          file.Write("cd VMware" + Environment.NewLine);
          file.Write("cd VMware OVF Tool" + Environment.NewLine);
          file.WriteLine("start ovftool.exe --powerOffSource vi://",TxtUsername.Text);
          file.Close();
        }