单击gridview按钮时页面未刷新

Question

I already asked a question about this problem, but as I progressed in my web application I stumbled across this problem again, because the answer there gave me a new problem. With that solution, I had the problem that the update button did not read the new value in the textbox of my gridview, but instead it read the old value.

CodeBehind

With this it doesn't use the new value:

protected void Page_Load(object sender, EventArgs e)
    {
        LoadData();
        if (!Page.IsPostBack)
        {
            DataBinder();
        }
    }

    private void DataBinder()
    {
        Grid30.DataBind();
        Grid31.DataBind();
        Grid32.DataBind();
        Grid33.DataBind();
        Grid34.DataBind();
        Grid35.DataBind();
        Grid36.DataBind();
        Grid37.DataBind();
        Grid38.DataBind();
        Grid40.DataBind();
        Grid41.DataBind();
        Grid42.DataBind();
        Grid43.DataBind();
        Grid44.DataBind();
        Grid45.DataBind();
        Grid51.DataBind();
        Grid52.DataBind();
        Grid53.DataBind();
        Grid54.DataBind();
        Grid55.DataBind();
        Grid56.DataBind();
        Grid57.DataBind();
        Grid58.DataBind();
        Grid61.DataBind();
        Grid62.DataBind();
        Grid63.DataBind();
        Grid64.DataBind();
    }

And with this it gets the new value, but it no longer refreshes:

    protected void Page_Load(object sender, EventArgs e)
    {
        LoadData();
        DataBinder();

    }

    private void DataBinder()
    {
        if (!Page.IsPostBack)
        {
            Grid30.DataBind();
            Grid31.DataBind();
            Grid32.DataBind();
            Grid33.DataBind();
            Grid34.DataBind();
            Grid35.DataBind();
            Grid36.DataBind();
            Grid37.DataBind();
            Grid38.DataBind();
            Grid40.DataBind();
            Grid41.DataBind();
            Grid42.DataBind();
            Grid43.DataBind();
            Grid44.DataBind();
            Grid45.DataBind();
            Grid51.DataBind();
            Grid52.DataBind();
            Grid53.DataBind();
            Grid54.DataBind();
            Grid55.DataBind();
            Grid56.DataBind();
            Grid57.DataBind();
            Grid58.DataBind();
            Grid61.DataBind();
            Grid62.DataBind();
            Grid63.DataBind();
            Grid64.DataBind();
        }
    }

Update/LoadData Code

    protected void Grid36_RowUpdating(object sender, GridViewUpdateEventArgs e)
    {

        GridViewRow row = Grid36.Rows[e.RowIndex];

        var txtQuantity = (TextBox)row.FindControl("Spoor36TB");
        int quantity = int.Parse(txtQuantity.Text);

        Grid36.EditIndex = -1;
        DataBinder();
    }

    private void LoadData()
    {
        foreach(Rail rail in getAllPositions())
        {
            DataTable dt = new DataTable();
            dt.Columns.Add(new DataColumn(rail.RailNr.ToString(), typeof(string)));
            for (int i = 0; i < rail.AmountOfPositions; i++)
            {
                DataRow dr = dt.NewRow();
                dr[rail.RailNr.ToString()] = "1";
                dt.Rows.Add(dr);
            }
            DataSources(rail.RailNr, dt);
        }
    }

EDIT Well I removed the DataBinder(); under Grid36_RowEditing(). This is no real solution, but a bad workaround for the moment. Now I have to push the edit button twice, but atleast I'm able to Update the grid. This is no/a horrible solution for my problem though, I hope someone will still be able to give me a real solution

    protected void Grid36_RowEditing(object sender, GridViewEditEventArgs e)
    {
        Grid36.EditIndex = e.NewEditIndex;
        //DataBinder();
    }

Answer 1

In Row updating method, Update the value in the database and then execute datasource as well as databind method.

Example :-

GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
int id = Int32.Parse(GridView1.DataKeys[e.RowIndex].Value.ToString());
TextBox tname = (TextBox)row.FindControl("nam");
TextBox tques = (TextBox)row.FindControl("que");
MySqlCommand cmd = new MySqlCommand("update exam set name1=@name,ques=@ques where id = @id", con);
cmd.Parameters.Add("@id", MySqlDbType.Int16).Value = id;
cmd.Parameters.Add("@name", MySqlDbType.VarChar, 30).Value = tname.Text.Trim();
cmd.Parameters.Add("@ques", MySqlDbType.VarChar,40).Value = tques.Text.Trim();
con.Open();
cmd.ExecuteNonQuery();
GridView1.EditIndex = -1;
// Bind grid now
 GridView1.DataSource= dt; // get data from database
 GridView1.Databind();