How can I read .odt file into a string in ASP.NET

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ASP.NET

I need to read .odt file document content into string can anyone please help me to how to do this in asp.net.

Thank you.

What I have tried:

I tried this but it not working
protected void btnread_Click(object sender, EventArgs e)
{
string text;
using (var streamReader = new StreamReader(@"E:\demo.odt", System.Text.Encoding.UTF8))
{
textbox1.Text = streamReader.ReadToEnd();

}


here textbox1 is the multi line type mode. here it read but it shows the symbols insted of data can any one help me out.
thank you.