I Have Created Dynamic Table Row...But When I Create New Row,Then Previous Textbox And Dropdownlist Is Getting Refreshed...How To Solve This Problem?

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C#

i have created dynamic table row...but when i create new row,then previous textbox and dropdownlist is getting refreshed...how to solve this problem?

this is my code...:

protected void btnAdd_Click(object sender, EventArgs e)
{
Panel1.Controls.Clear();
panel1_Click = panel1_Click+1;
fnpanel1();

}

protected void fnpanel1()
{

for (int i = 0; i < panel1_Click; i++)
{
TextBox TxtBox = new TextBox();
DropDownList ddl = new DropDownList();
HiddenField hdnpanel = new HiddenField();
TxtBox.ID = "TxtBoxpanel1" + i.ToString();
ddl.ID = "ddlpanel1" + i.ToString();
hdnpanel.ID = "hnpanel1" + i.ToString();


Panel1.Controls.Add(ddl);
Panel1.Controls.Add(TxtBox);
Panel1.Controls.Add(hdnpanel);

}
}