Forms Data Controls :: Unable To Capture The Updated Value Of Texbox Within Gridview: TextBox TextNewQuantity = (TextBox)

I have been trying to achieve the following:

1-Allow the user to change the quantity in a textbox i.e // "txtQuantity"

2-capture the newly entered quantity i.e //int integerNewQuantity= int.Parse(textNewQuantity.Text);

3-update the database using the newly entered quantity i.e. //UpdateItem(data,integerNewQuantity)

Problem:1-I have not been able to capture the text i.e. the newly entered quantity i.e. the value entered in the text box "txtQuantity"

2-Hence the database is updated using the existing value and NOT the new value unless I make a constant assignment as below:

textNewQuantity.Text = "2"; When tested the assignment of any number correctly updates the database. see the c# code:

C# code: Version.1
protected void btnUpdate_Click(object sender, EventArgs e)
{
txtItemDescription.Text = txtItemDescription.Text + "from btnUpdate talking.."; [code]....