如何在C＃asp.net中检索输入查询文本框的值？

Question

示例我有一个文本框输入，输入文本框的内容自定义查询用户输入的内容，文本框中的示例，我尝试输入文本＆＃34;从国家/地区选择ID，名称，国家/地区＃34; ..从sql查询对国家表的3 coloumn的结果，我问如何取列数，文本框自定义输入的列名..到我要在文本框中显示的列数和gridview中的行数在查询中适当的列数，对于我想在gridview中显示的列的名称..

 private void BindReportColumn(String report_id)
{
    dt = mda.GetData("SELECT column_name,column_text,size,back_color,fore_color FROM report_column INNER JOIN report ON report_column.report_id = report.report_id and report.report_id='" + report_id + "'", connStr).Tables[0];
     GridCustomColumn.DataSource = dt;
    GridCustomColumn.DataBind();
}
  private void addcolumn()
    {
        int i;
        //Add the items to the gridview

            DataTable dt = new DataTable();
            //Assign the viewstate to the datatable
            if (!IsNumeric(txtcolumn_count.Text)) txtcolumn_count.Text = "0";
            dt = (DataTable)ViewState["columnreport"];

            for (i = 1; i <= Convert.ToInt32(txtcolumn_count.Text); i++)
            {
                DataRow dr = dt.NewRow();
                //dr["report_id"] = txtreport_id.Text;
                dr["column_name"] = "";
                dr["column_text"] = " ";
                dr["size"] = 0;
                dr["back_color"] = "";
                dr["fore_color"] = "";
                //Add the datarow to the datatable
                dt.Rows.Add(dr);
                //Now bind the datatable to the gridview
                GridCustomColumn.DataSource = dt;
                GridCustomColumn.DataBind();


                //Add the details to viewstate also
                ViewState["columnreport"] = dt;
            }
    }

提前致谢