如何将值（从每个文本框添加的总值）分配给gridview中的“txtTotal”文本框

Question

我有一个gridview

                                                                           '/＆gt;                                                                   总计的                                                                                                                                                                                                                                    

我的代码背后：

protected void btnGetTotal_Click(object sender, EventArgs e)
{
    int Rowindex = 0;

    StringCollection sc = new StringCollection();

    if (ViewState["CurrentTable"] != null)
    {
        DataTable dtCurrenttable = (DataTable)ViewState["CurrentTable"];

        if (dtCurrenttable.Rows.Count > 0)
        {
            for (int i = 1; i <= dtCurrenttable.Rows.Count; i++)
            {
                TextBox txtFeesAmount = (TextBox)gvSales.Rows[Rowindex].Cells[1].FindControl("txtAmount");

                Total += Convert.ToInt32( txtFeesAmount.Text);
                tostring= Total.ToString();
                tostring = ((TextBox)gvSales.FooterRow.FindControl("txtTotal")).Text;

            }
        }
    }


}

添加了taxtbox中的值，并且在页脚模板中显示时，它不会添加附加值。 它给了我错误：

对象引用未设置为对象的实例。

如何将值（从每个文本框添加的总值）分配到gridview中的'textTotal'文本框

即在这一行

tostring =（（TextBox）gvSales.FooterRow.FindControl（“txtTotal”））。Text;

Answer 1

这样做：

grdList.Columns[2].FooterText = sumDebit.ToString();