How to get row index value in link button in gridview

i can able to get the row index but i want to get beneficiaryID based on that i need to display remaining column values i unable to bind the selected row value pls help me

My Code

protected void lnkbtnView_Click(object sender, EventArgs e)
{
     LinkButton button = (LinkButton)sender;
     GridViewRow row = (GridViewRow)button.NamingContainer;
     if (row != null)
     {
         int i = row.RowIndex;
     }
     DataTable dt = new DataTable();
     lblBenId.Text = dt.Rows[0]["BeneficiaryID"].ToString();
     lblBenCode.Text = dt.Rows[0]["BeneficiaryCode"].ToString();
     lblBenName.Text = dt.Rows[0]["BeneficiaryName"].ToString();
     lblAccountNumber.Text = dt.Rows[0]["AccountNumber"].ToString();
     lblIFSC.Text = dt.Rows[0]["IFSC"].ToString();
     lblNameAsPerBank.Text = dt.Rows[0]["NameAsPerBank"].ToString();
}

protected void lnkbtnView_Click(object sender, EventArgs e)
{
    LinkButton button = (LinkButton)sender;
    GridViewRow row = (GridViewRow)button.NamingContainer;
    if (row != null)
    {
        int rowIndex = row.RowIndex;
        GridView gv = (GridView)row.NamingContainer;
        DataTable dt = (DataTable)gv.DataSource;
        string beneficiaryID = dt.Rows[rowIndex]["BeneficiaryID"].ToString();
        string beneficiaryCode = dt.Rows[rowIndex]["BeneficiaryCode"].ToString();
        string beneficiaryName = dt.Rows[rowIndex]["BeneficiaryName"].ToString();
        string accountNumber = dt.Rows[rowIndex]["AccountNumber"].ToString();
        string ifsc = dt.Rows[rowIndex]["IFSC"].ToString();
        string nameAsPerBank = dt.Rows[rowIndex]["NameAsPerBank"].ToString();

        lblBenId.Text = beneficiaryID;
        lblBenCode.Text = beneficiaryCode;
        lblBenName.Text = beneficiaryName;
        lblAccountNumber.Text = accountNumber;
        lblIFSC.Text = ifsc;
        lblNameAsPerBank.Text = nameAsPerBank;
    }
}