Setting previous data in Grid View

Question

i have a grid view that , user will have to type something in the textboxes and wadever the user type will be inserted into the database , i have this 2 problem or issues whereby , everytime i click the "+" button ( adds news row ) , one of the textbox of the previous row data will be removed .. And the radiobutton selected will be removed as well. Heres is the screenshot what the problem is :

After clicking the " + " button , it will turn to be like this :

This is my code behind :

 private void AddNewRowToGrid()
    {
        int rowIndex = 0;

        CheckBox chkbox1 = (CheckBox)GridView1.Rows[rowIndex].Cells[2].FindControl("CheckBox1");
        CheckBox chkbox2 = (CheckBox)GridView1.Rows[rowIndex].Cells[2].FindControl("CheckBox2");

        if (ViewState["CurrentTable"] != null)
        {
            DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
            DataRow drCurrentRow = null;
            if (dtCurrentTable.Rows.Count > 0)
            {
                for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                {
                    //extract the TextBox values
                    TextBox box1 = (TextBox)GridView1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                    TextBox box3 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox3");

                    drCurrentRow = dtCurrentTable.NewRow();


                    dtCurrentTable.Rows[i - 1]["Question"] = box1.Text;       
                    dtCurrentTable.Rows[i - 1]["Hints"] = box3.Text;


                    rowIndex++;
                }
                dtCurrentTable.Rows.Add(drCurrentRow);
                ViewState["CurrentTable"] = dtCurrentTable;

                GridView1.DataSource = dtCurrentTable;
                GridView1.DataBind();
            }
        }
        else
        {
            Response.Write("ViewState is null");
        }

        //  Set Previous Data on Postbacks
        SetPreviousData();
    }

     private void SetInitialRow()
    {
        DataTable dt = new DataTable();
        DataRow dr = null;
        dt.Columns.Add(new DataColumn("Question", typeof(string)));
        dt.Columns.Add(new DataColumn("Hints", typeof(string)));

        dr = dt.NewRow();
        dr["Question"] = string.Empty;
        dr["Hints"] = string.Empty;


        dt.Rows.Add(dr);


        //Store the DataTable in ViewState
        ViewState["CurrentTable"] = dt;

        GridView1.DataSource = dt;
        GridView1.DataBind();
    }

    private void SetPreviousData()
    {
        int rowIndex = 0;
        if (ViewState["CurrentTable"] != null)
        {
            DataTable dt = (DataTable)ViewState["CurrentTable"];
            if (dt.Rows.Count > 0)
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    TextBox box1 = (TextBox)GridView1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                    TextBox box2 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                    TextBox box3 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox3");



                    //Setting previous text to the respective textboxes based on columns.
                    box1.Text = dt.Rows[i]["Question"].ToString();
                    box2.Text = dt.Rows[i]["Hints"].ToString(); 
                    box3.Text = dt.Rows[i]["Hints"].ToString(); 


                    Session["Question1"] = box1.Text;
                    rowIndex++;
                }
            }
        }
    }

I can easily do this when only there is one textbox on each columns .. but now there is 2 textboxes on each columns ... because i can only append text to the textboxes based on columns names ... Also , how do i maintain my radiobutton help is appreciated , thanks !

Answer 1

 private void AddNewRowToGrid()
        {
            int rowIndex = 0;

            CheckBox chkbox1 = (CheckBox)GridView1.Rows[rowIndex].Cells[2].FindControl("CheckBox1");
            CheckBox chkbox2 = (CheckBox)GridView1.Rows[rowIndex].Cells[2].FindControl("CheckBox2");

            if (ViewState["CurrentTable"] != null)
            {
                DataTable dtCurrentTable = (DataTable)ViewState["CurrentTable"];
                DataRow drCurrentRow = null;
                if (dtCurrentTable.Rows.Count > 0)
                {
                    for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
                    {
                        //extract the TextBox values
                        TextBox box1 = (TextBox)GridView1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                        TextBox box2 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                        TextBox box3 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox3");

                        drCurrentRow = dtCurrentTable.NewRow();


                        dtCurrentTable.Rows[i - 1]["Question"] = box1.Text;         
                        dtCurrentTable.Rows[i - 1]["Hints"] = box2.Text;
                        dtCurrentTable.Rows[i - 1]["Hints1"] = box3.Text;


                        rowIndex++;
                    }
                    dtCurrentTable.Rows.Add(drCurrentRow);
                    ViewState["CurrentTable"] = dtCurrentTable;

                    GridView1.DataSource = dtCurrentTable;
                    GridView1.DataBind();
                }
            }
            else
            {
                Response.Write("ViewState is null");
            }

            //  Set Previous Data on Postbacks
            SetPreviousData();
        }

         private void SetInitialRow()
        {
            DataTable dt = new DataTable();
            DataRow dr = null;
            dt.Columns.Add(new DataColumn("Question", typeof(string)));
            dt.Columns.Add(new DataColumn("Hints", typeof(string)));
            dt.Columns.Add(new DataColumn("Hints1", typeof(string)));

            dr = dt.NewRow();
            dr["Question"] = string.Empty;
            dr["Hints"] = string.Empty;
            dr["Hints1"] = string.Empty;


            dt.Rows.Add(dr);


            //Store the DataTable in ViewState
            ViewState["CurrentTable"] = dt;

            GridView1.DataSource = dt;
            GridView1.DataBind();
        }

        private void SetPreviousData()
        {
            int rowIndex = 0;
            if (ViewState["CurrentTable"] != null)
            {
                DataTable dt = (DataTable)ViewState["CurrentTable"];
                if (dt.Rows.Count > 0)
                {
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        TextBox box1 = (TextBox)GridView1.Rows[rowIndex].Cells[1].FindControl("TextBox1");
                        TextBox box2 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox2");
                        TextBox box3 = (TextBox)GridView1.Rows[rowIndex].Cells[2].FindControl("TextBox3");



                        //Setting previous text to the respective textboxes based on columns.
                        box1.Text = dt.Rows[i]["Question"].ToString();
                        box2.Text = dt.Rows[i]["Hints"].ToString(); 
                        box3.Text = dt.Rows[i]["Hints1"].ToString(); 


                        Session["Question1"] = box1.Text;
                        rowIndex++;
                    }
                }
            }
        }

I just added another column rest of code was already working fine.