Zapis nowej linii w GridView/TemplateField/TextBox

<asp:TemplateField HeaderText="News_text" SortExpression="News_text">
    <EditItemTemplate>
        <asp:TextBox runat="server" TextMode="MultiLine" Text='<%# Bind("News_text") %>' ID="TextBox1"></asp:TextBox>
    </EditItemTemplate>                
    <ItemTemplate>
        <asp:Label ID="Label1" runat="server" Text='<%# Bind("News_text") %>'></asp:Label>
    </ItemTemplate>
</asp:TemplateField>

 
string abc = textBox1.Text;
string tabc = tabc.Replace("<b>", "\r\n");
textBox1.Text = tabc;

 
<EditItemTemplate>
        <asp:TextBox runat="server" TextMode="MultiLine" Text='<%# Bind("news_text") %>' ID="tb1" OnTextChanged = "tb1_TextChanged" ></asp:TextBox>
    </EditItemTemplate>      

 
protected void tb1_TextChanged(object sender, EventArgs e)
 {
TextBox thisTextBox = (TextBox)sender;
GridViewRow thisGridViewRow = (GridViewRow)thisTextBox.Parent.Parent;
int row = thisGridViewRow.RowIndex;

TextBox w = (TextBox)GridView1.Rows[row].Cells[0].FindControl("tb1");
w.Text = w.Text.Replace(Environment.NewLine, "<br />");
}

 
<div>
        <asp:GridView ID="GridView1" AutoGenerateColumns = "false" runat="server" 
            DataSourceID="SqlDataSource1" AutoGenerateEditButton = "true" 
            DataKeyNames = "news_number"  >
        <Columns>
        <asp:TemplateField HeaderText="News_text" SortExpression="News_text">
    <EditItemTemplate>
        <asp:TextBox runat="server" TextMode="MultiLine" Text='<%# Bind("news_text") %>' ID="TextBox1" OnTextChanged = "TextBox1_TextChanged" ></asp:TextBox>
    </EditItemTemplate>                
    <ItemTemplate>
        <asp:Label ID="Label1" runat="server" Text='<%# Eval("news_text").ToString().Replace("\n", "<br />") %>'></asp:Label>
    </ItemTemplate>
      </asp:TemplateField>
     </Columns>
        </asp:GridView>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:szymonConnectionString %>" 
            SelectCommand="SELECT [news_number], [news_text] FROM [news_test]" 
            UpdateCommand="UPDATE [news_test] SET [news_text] = @news_text where [news_number] = @news_number" >
            <UpdateParameters>
            <asp:Parameter Type = "Int32" Name = "news_number" />
            <asp:Parameter Type = "String" Name = "news_text" />
            </UpdateParameters>
        </asp:SqlDataSource>
    </div>

 
 protected void TextBox1_TextChanged(object sender, EventArgs e)
        {
            TextBox thisTextBox = (TextBox)sender;
            GridViewRow thisGridViewRow = (GridViewRow)thisTextBox.Parent.Parent;
            int row = thisGridViewRow.RowIndex;

            TextBox w = (TextBox)GridView1.Rows[row].Cells[0].FindControl("TextBox1");
            w.Text = w.Text.Replace(Environment.NewLine, "\n");
        }

protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
    TextBox tb1 = (TextBox)this.GridView1.FindControl("TextBox1");
    tb1.Text = tb1.Text.Replace(Environment.NewLine, "<br />");
} 

protected void TbNewText_DataBinding(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    tb.Text = tb.Text.Replace("<br />", Environment.NewLine);
}
protected void TbNewText_TextChanged(object sender, EventArgs e)
{
    TextBox tb = (TextBox)sender;
    tb.Text = tb.Text.Replace(Environment.NewLine, "<br />");
}