Automatically adding <div class="ExternalClassE7D56B8D72FF4453B3F162CE43ABBF0A"> in field in custom list

Question

When I created content for custom list. It is "gegtege". After I create a asp:textbox that calling this field and display "<div class="ExternalClassE7D56B8D72FF4453B3F162CE43ABBF0A">" in txtComment.Text.

I don't understand and how to remove it?

SPWeb webObj = SPContext.Current.Web;
            //SPFolder ManagerSubMainList = webObj.Folders["ManagerSubMainList"];
            //SPFolder AssignerMainList = webObj.Folders["AssignerMainList "];
            SPList listContract = webObj.Lists["MainList"];
            SPListItem thisItem = null;
            if (getId() > 0)
            {
                thisItem = listContract.GetItemById(getId());
                if(!string.IsNullOrEmpty(thisItem["Title"].ToString()))
                {
                    txtTitle.Text = thisItem["Title"].ToString();
                }
                if(!string.IsNullOrEmpty(thisItem["Comment"].ToString()))
                {
                    txtComment.Text = thisItem["Comment"].ToString();
                }


                //thisItem.Update();
            }

Answer 1

In your list, make sure that the Multiple lines of text column setting is set to plain text

• Go to list setting
• click on the column name.
• Beside Additional Column Settings, Check Plain text

Answer 2

Try below code:

SPWeb webObj = SPContext.Current.Web;
//SPFolder ManagerSubMainList = webObj.Folders["ManagerSubMainList"];
//SPFolder AssignerMainList = webObj.Folders["AssignerMainList "];
SPList listContract = webObj.Lists["MainList"];
SPListItem thisItem = null;
if (getId() > 0)
{
    thisItem = listContract.GetItemById(getId());
    if(!string.IsNullOrEmpty(thisItem["Title"].ToString()))
    {
        txtTitle.Text = thisItem["Title"].ToString();
    }
    if(!string.IsNullOrEmpty(thisItem["Comment"].ToString()))
    {
        string comment = thisItem["Comment"].ToString();
        txtComment.Text = SPHttpUtility.ConvertSimpleHtmlToText(comment, comment.Length);       
    }

    //thisItem.Update();
}

Reference - SPHttpUtility.ConvertSimpleHtmlToText