Retrieve Current Login User

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C#

ASP.NET

Gridview

I need help. Yes, like seriously. I have been implement this so called system like a month. So far, everything is just nice but when it comes to database thingy I got STUCK! Ok, i have 8 textboxes which allow user to enter data. I declare each of the textbox as a column name so after user key in their data, all the value of the textbox will be kept in row respectively according to their column name. That part is done. The problem now, how can i retrieve back all the data that only related to user, lets say User A want to view only her/his data that need to be shown in gridview. Thank you. My table got username column too.

private string months;
private string expen1;
private string price1;
private string expen2;
private string price2;
private string expen3;
private string price3;
private string expen4;
private string price4;
private string expen5;
private string price5;
private string expen6;
private string price6;
private string expen7;
private string price7;
private string expen8;
private string price8;

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindGridview();
}
}
protected void BindGridview()
{
gvDetails.DataSource = (i dont know what to put here)
gvDetails.DataBind();
}
protected void gvDetails_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
gvDetails.EditIndex = -1;
BindGridview();
}
protected void gvDetails_RowEditing(object sender, GridViewEditEventArgs e)
{
gvDetails.EditIndex = e.NewEditIndex;
BindGridview();
}
protected void gvDetails_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
//* i dont know this part too (delete section)
}
protected void gvDetails_RowUpdating(object sender, GridViewUpdateEventArgs e)
{
//* this is for update thingy. Stuck too
gvDetails.EditIndex = -1;
BindGridview();
}