how to use "IsPostBack" & ViewState in c# windows appli..

Jyoti Jodha

public Form2()

{

InitializeComponent();

if (!this.IsPostBack)

{

DataTable dt = new DataTable();

dt.Columns.AddRange(new DataColumn[2] { new DataColumn("Name"), new DataColumn("Country") });

ViewState["Customers"] = dt;

this.BindGrid();

}

protected void BindGrid()

{

dataGridView.DataSource = (DataTable)ViewState["Customers"];

dataGridView.DataBind();

}

Error show in red highlight

6 Replies

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Ramesh Palanivel9y ago
Accepted answer
Hi Jyothi,
Try this code, to add textbox value in gridview dynamically
private void button3_Click(object sender, EventArgs e)
       {

           dataGridView2.Rows.Add();
           int count = dataGridView2.Rows.Count;
           dataGridView2.Rows[count - 2].Cells[0].Value =textBox1.Text;
           dataGridView2.Rows[count - 2].Cells[1].Value = textBox2.Text;
           dataGridView2.Rows[count - 2].Cells[2].Value = textBox3.Text;
       }
Jyoti Jodha9y ago
yes sir copy from internet

but i am want to textbox values store in temporarily gridview....???
Ramesh Palanivel9y ago
Hi Jyothi,

I think you have copied this code from internet. They wrote this code inside the web form. Not in windows form.

You cannot use it windows forms .. To replace write the sql queries to bind the datagrid view.
Jyoti Jodha9y ago
what is use replace Viewstate and is postback

how to slove this error
Ramesh Palanivel9y ago
Hi jyothi, Ispostback and viewstate are asp. Net oriented.. It will be only work in Internet application. Kindly mention Ur requirement.. I will give some alternative way to do that. If u want to know what's is Ispostback and viewstate let me know Ur suggestions.. We will help u...
Ranjeet Patra9y ago
Have a look at the below links:

http://stackoverflow.com/questions/21843728/can-page-ispostback-property-be-used-in-windows-forms-c-sharp

https://www.codeproject.com/articles/86503/saving-the-state-serializing-a-windows-form