check if button is clicked in if() condition aspx.net - asp.net

Question

I want to check if btnTest_Click is clicked in another Button6_Click event.Below is my code.....Please help
protected void btnTest_Click(object sender, EventArgs e)
{
Session["Counter1"] = newValue;
Session["Counter"] = newValue;
if (Session["Markici"] != null || Session["Markici"] != null)
{
var clickedRow = ((Button)sender).NamingContainer as GridViewRow;
var clickedIndex = clickedRow.RowIndex;
/*decimal*/ old = dtCurrentTable.Rows[clickedIndex].Field<decimal>("Kolicina");
decimal oldIznos = dtCurrentTable.Rows[clickedIndex].Field<decimal>("VkIznos");
decimal VkDanok = dtCurrentTable.Rows[clickedIndex].Field<decimal>("VkDanok");
string Cena1 = dtCurrentTable.Rows[clickedIndex].Field<string>("Cena1");
int TarifaID = dtCurrentTable.Rows[clickedIndex].Field<Int16>("TarifaID");
}
protected void Button6_Click(object sender, EventArgs e)
{
// how to check here if btnTest_Click is clickied
if()
}

Answer 1

as per Kevin's answer but instead of:
protected bool testPassed;
Have this:
protected bool testPassed
{
get { return (bool)ViewState["testpassed"]; }
set { ViewState["testpassed"] = value; }
}
By accessing the value of this property via view state the value will persist between requests.

Answer 2

I would declare a class level boolean called testPassed.
Set it to false in the onload event if it is not a Postback.
Set it to true in the btnTest_Click event handler
Edit to add an example:
protected bool testPassed
{
get { return (bool)ViewState["testpassed"]; }
set { ViewState["testpassed"] = value; }
}
protected override void OnLoad(EventArgs e)
{
if (!Page.IsPostBack)
{
testPassed=false;
}
}
protected void btnTest_Click(object sender, EventArgs e)
{
Session["Counter1"] = newValue;
Session["Counter"] = newValue;
if (Session["Markici"] != null || Session["Markici"] != null)
{
var clickedRow = ((Button)sender).NamingContainer as GridViewRow;
var clickedIndex = clickedRow.RowIndex;
/*decimal*/ old = dtCurrentTable.Rows[clickedIndex].Field<decimal>("Kolicina");
decimal oldIznos = dtCurrentTable.Rows[clickedIndex].Field<decimal>("VkIznos");
decimal VkDanok = dtCurrentTable.Rows[clickedIndex].Field<decimal>("VkDanok");
string Cena1 = dtCurrentTable.Rows[clickedIndex].Field<string>("Cena1");
int TarifaID = dtCurrentTable.Rows[clickedIndex].Field<Int16>("TarifaID");
testPassed=true;
}
protected void Button6_Click(object sender, EventArgs e)
{
// how to check here if btnTest_Click is clickied
if(testPassed)
}